Description of problem:
Only for rhevm hypervisor, failed to run the virt-who configured with unreachable http_proxy when set up the no_proxy=[hypervisor_server] and rhsm_no_proxy=[register_server]

Version-Release number of selected component (if applicable):
virt-who-1.30.12-1.el8.noarch
rhel8.7

How reproducible:
100%

Steps to Reproduce:
1. Create the virt-who config file in /etc/virt-who.d
[virtwho-config]
type=rhevm
server=[rhevm_server]
username=[username]
password=[password]
owner=[owner_id]

2. run the virt-who service by the command: service virt-who restart

3. virt-who runs normally

4. configure the unreachable http_prxoy in /etc/sysconfig/virt-who
http_proxy=http://10.73.3.xx:9999

5. configure the no_proxy=[rhevm_server] in /etc/sysconfig/virt-who
no_proxy=[rhevm_server]

6. configure the rhsm_no_proxy=[register_server] in /etc/virt-who.conf
[defaults]
rhsm_no_proxy=subscription.rhsm.stage.redhat.com

7. run the virt-who service by the command: service virt-who restart

Actual results:
virt-who shown the error message:
-----------------------------
2022-06-16 06:47:11,919 [virtwho.parser WARNING] MainProcess(137570):MainThread @parser.py:read_config_env_variables:237 - The use of environment variables and the use of the sysconfig file to configure virt-who are deprecated. Their use will be ignored in the next major release.
2022-06-16 06:47:11,923 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "oneshot" not set, using default: False
2022-06-16 06:47:11,923 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "print_" not set, using default: False
2022-06-16 06:47:11,923 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "log_per_config" not set, using default: False
2022-06-16 06:47:11,923 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "configs" not set, using default: []
2022-06-16 06:47:11,924 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "reporter_id" not set, using default: rhel-8-7-0-20220524-0-rhevm-59910.redhat.com-ba7c4251bb7241888c031f27cb5a3405
2022-06-16 06:47:11,924 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "interval" not set, using default: 3600
2022-06-16 06:47:11,924 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "log_file" not set, using default: rhsm.log
2022-06-16 06:47:11,924 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [global]: Value for "log_dir" not set, using default: /var/log/rhsm
2022-06-16 06:47:11,924 [virtwho.rhsm_log DEBUG] MainProcess(137570):MainThread @config.py:init_config:1594 - [virtwho-config]: Value for "hypervisor_id" not set, using default: uuid
2022-06-16 06:47:11,924 [virtwho.rhsm_log INFO] MainProcess(137570):MainThread @config.py:init_config:1594 - [virtwho-config]: The original server URL was incomplete. It has been enhanced to https://bootp-73-131-193.rhts.eng.pek2.redhat.com:443/
2022-06-16 06:47:11,925 [virtwho.rhsm_log INFO] MainProcess(137570):MainThread @executor.py:_init_:54 - Using config named 'virtwho-config'
2022-06-16 06:47:11,925 [virtwho.rhsm_log INFO] MainProcess(137570):MainThread @main.py:main:176 - Using configuration "virtwho-config" ("rhevm" mode)
2022-06-16 06:47:11,925 [virtwho.rhsm_log INFO] MainProcess(137570):MainThread @main.py:main:178 - Using reporter_id='rhel-8-7-0-20220524-0-rhevm-59910.redhat.com-ba7c4251bb7241888c031f27cb5a3405'
2022-06-16 06:47:11,927 [virtwho.main DEBUG] MainProcess(137570):MainThread @executor.py:run:187 - Starting infinite loop with 3600 seconds interval
2022-06-16 06:47:11,940 [rhsm.https DEBUG] MainProcess(137570):MainThread @https.py:<module>:56 - Using standard libs to provide httplib and ssl
2022-06-16 06:47:11,949 [virtwho.main DEBUG] MainProcess(137570):Thread-2 @virt.py:run:407 - Thread 'virtwho-config' started
2022-06-16 06:47:11,954 [virtwho.destination_-515115144285168198 DEBUG] MainProcess(137570):Thread-3 @virt.py:run:407 - Thread 'destination_-515115144285168198' started
2022-06-16 06:47:11,958 [virtwho.main ERROR] MainProcess(137570):Thread-2 @virt.py:run:416 - Thread 'virtwho-config' fails with error: Unable to connect to RHEV-M server: HTTPSConnectionPool(host='bootp-73-131-193.rhts.eng.pek2.redhat.com', port=443): Max retries exceeded with url: /ovirt-engine/api/v4/clusters (Caused by ProxyError('Cannot connect to proxy.', NewConnectionError('<urllib3.connection.VerifiedHTTPSConnection object at 0x7ff001771d30>: Failed to establish a new connection: [Errno 111] Connection refused',)))
2022-06-16 06:47:11,959 [virtwho.main INFO] MainProcess(137570):Thread-2 @virt.py:_send_data:986 - Report for config "virtwho-config" gathered, placing in datastore
2022-06-16 06:47:11,960 [virtwho.main INFO] MainProcess(137570):Thread-2 @virt.py:run:440 - Waiting 3600 seconds before performing action again 'virtwho-config'
2022-06-16 06:47:12,956 [virtwho.destination_-515115144285168198 DEBUG] MainProcess(137570):Thread-3 @subscriptionmanager.py:_connect:152 - Authenticating with certificate: /etc/pki/consumer/cert.pem
2022-06-16 06:47:12,958 [rhsm.connection DEBUG] MainProcess(137570):Thread-3 @connection.py:_init_:173 - Environment variable NO_PROXY= will be used
2022-06-16 06:47:12,960 [rhsm.connection DEBUG] MainProcess(137570):Thread-3 @connection.py:_init_:268 - Connection built: http_proxy=10.73.3.24:9999 host=subscription.rhsm.stage.redhat.com port=443 handler=/subscription auth=identity_cert ca_dir=/etc/rhsm/ca/ insecure=0
2022-06-16 06:47:12,957 [virtwho.destination_-515115144285168198 INFO] MainProcess(137570):Thread-3 @subscriptionmanager.py:_connect:159 - X-Correlation-ID: 45e3a3e958a94520938176f4e0adf887
2022-06-16 06:47:12,963 [rhsm.connection DEBUG] MainProcess(137570):Thread-3 @connection.py:_request:728 - Making request: GET /subscription/status/
2022-06-16 06:47:12,966 [rhsm.connection DEBUG] MainProcess(137570):Thread-3 @connection.py:_create_connection:599 - Using proxy: 10.73.3.24:9999
2022-06-16 06:47:12,968 [virtwho.destination_-515115144285168198 ERROR] MainProcess(137570):Thread-3 @virt.py:run:421 - Thread 'destination_-515115144285168198' fails with exception:
Traceback (most recent call last):
File "/usr/lib64/python3.6/site-packages/rhsm/connection.py", line 747, in _request
conn.request(request_type, handler, body=body, headers=final_headers)
File "/usr/lib64/python3.6/http/client.py", line 1273, in request
self._send_request(method, url, body, headers, encode_chunked)
File "/usr/lib64/python3.6/http/client.py", line 1319, in _send_request
self.endheaders(body, encode_chunked=encode_chunked)
File "/usr/lib64/python3.6/http/client.py", line 1268, in endheaders
self._send_output(message_body, encode_chunked=encode_chunked)
File "/usr/lib64/python3.6/http/client.py", line 1044, in _send_output
self.send(msg)
File "/usr/lib64/python3.6/http/client.py", line 982, in send
self.connect()
File "/usr/lib64/python3.6/http/client.py", line 1433, in connect
super().connect()
File "/usr/lib64/python3.6/http/client.py", line 954, in connect
(self.host,self.port), self.timeout, self.source_address)
File "/usr/lib64/python3.6/socket.py", line 724, in create_connection
raise err
File "/usr/lib64/python3.6/socket.py", line 713, in create_connection
sock.connect(sa)
ConnectionRefusedError: [Errno 111] Connection refused

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/usr/lib/python3.6/site-packages/virtwho/virt/virt.py", line 412, in run
self._run()
File "/usr/lib/python3.6/site-packages/virtwho/virt/virt.py", line 368, in _run
self._send_data(data_to_send)
File "/usr/lib/python3.6/site-packages/virtwho/virt/virt.py", line 604, in _send_data
self.dest.hypervisorHeartbeat(config=self.config, options=self.options)
File "/usr/lib/python3.6/site-packages/virtwho/manager/subscriptionmanager/subscriptionmanager.py", line 270, in hypervisorHeartbeat
connection = self._connect(config)
File "/usr/lib/python3.6/site-packages/virtwho/manager/subscriptionmanager/subscriptionmanager.py", line 167, in _connect
if not self.connection.ping()['result']:
File "/usr/lib64/python3.6/site-packages/rhsm/connection.py", line 1071, in ping
return self.conn.request_get("/status/")
File "/usr/lib64/python3.6/site-packages/rhsm/connection.py", line 934, in request_get
return self._request("GET", method, headers=headers, cert_key_pairs=cert_key_pairs)
File "/usr/lib64/python3.6/site-packages/rhsm/connection.py", line 967, in _request
info=info, headers=headers, cert_key_pairs=cert_key_pairs)
File "/usr/lib64/python3.6/site-packages/rhsm/connection.py", line 788, in _request
err))
rhsm.connection.ProxyException: Unable to connect to: 10.73.3.24:9999 [Errno 111] Connection refused
2022-06-16 06:47:12,972 [virtwho.destination_-515115144285168198 INFO] MainProcess(137570):Thread-3 @virt.py:_send_data:615 - Error report received
2022-06-16 06:47:12,972 [virtwho.destination_-515115144285168198 INFO] MainProcess(137570):Thread-3 @virt.py:run:440 - Waiting 3600 seconds before performing action again 'destination_-515115144285168198'
2022-06-16 06:47:39,992 [virtwho.main DEBUG] MainProcess(137570):MainThread @executor.py:terminate:225 - virt-who is shutting down
--------------------------

Expected results:
virt-who runs normally

Additional info:
this case only failed for rhevm hypervisor.
similar bug：https://bugzilla.redhat.com/show_bug.cgi?id=1739358