Description of problem:

Registering host with 'setup_remote_execution=true' doesn't help in automatic Remote Execution.

How reproducible:

• Easily

Is this issue a regression from an earlier version:

• NA

Steps to Reproduce:

1. Register host using 'setup_remote_execution=true'

2. Try to perform remote execution after successful registration

Actual behavior:

REX job fails with:

      false, "msg": "Failed to connect to the host via ssh: root@10.xx.xx.xx: Permission

Updated setting: Connect by IP false:
~~~
 1: Error initializing command: RuntimeError - Could not establish connection to remote host using any available authentication method, tried publickey
   2: 
   3: Authentication method 'publickey' failed with:
   4: root@client.example.com: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
   5: Exit status: EXCEPTION
   6: StandardError: Job execution failed
~~~

Expected behavior:
REX job should not fail with above error.

Business Impact / Additional info: