[py, win] memory leak from BlockingConnection reconnection

C:/Python27/python.exe -c 'import proton; print(proton.VERSION)'
(0, 30, 0)

$ C:/Python27/python.exe C:/home/buildadm/workspace/dtests-amq-clients-p2p-windows/dtests/dtests/node_data/reproducers/ENTMQCL-1578_test.py
Floop 11675
connected

Connection amqp://127.0.0.1:51079
 disconnected: Condition('amqp:connection:framing-error', 'connection aborted')
link close() failed 11689
conn closed 11671
loop 11749
connected

Connection amqp://127.0.0.1:51079
 disconnected: Condition('amqp:connection:framing-error', 'connection aborted')
link close() failed 11725
conn closed 11707
loop 11785
connected

Connection amqp://127.0.0.1:51079
 disconnected: Condition('amqp:connection:framing-error', 'connection aborted')
link close() failed 11761
conn closed 11743
loop 11821
connected

Connection amqp://127.0.0.1:51079
 disconnected: Condition('amqp:connection:framing-error', 'connection aborted')
link close() failed 11797
conn closed 11779
received exception Connection amqp://127.0.0.1:51079
 disconnected: Condition('proton.pythonio', 'Connection refused to all addresses') on connect/subscribe, retry
loop 11835
connected

Connection amqp://127.0.0.1:51079
 disconnected: Condition('amqp:connection:framing-error', 'connection aborted')
link close() failed 11833
conn closed 11815
client.object_counts: [11675, 11749, 11785, 11821, 11835]

======================================================================
FAIL: test_blocking_connection_object_leak (__main__.BlockingConnectionObjectLeakTests)
----------------------------------------------------------------------
Traceback (most recent call last):
  File "C:/home/buildadm/workspace/dtests-amq-clients-p2p-windows/dtests/dtests/node_data/reproducers/ENTMQCL-1578_test.py", line 139, in test_blocking_connection_object_leak
    self.assertEqual([0] * 4, diffs, "Object counts should not be increasing")
AssertionError: Object counts should not be increasing

----------------------------------------------------------------------
Ran 1 test in 18.734s

FAILED (failures=1)

>>> a = [11675, 11749, 11785, 11821, 11835]
>>> [b - a for a, b in zip(a, a[1:])]
[74, 36, 36, 14]