Fix concurrent socket connection issue #44
Merged
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Closes #40
This makes the TCP client safe to use across threads by allowing only a single thread to connect at a time. Additionally, it adds a single connect+retry for messages that fail because of a disconnected peer. Note that there is currently an issue with the
test_can_recover_from_agent_shutdown
that is a result of the test socket not being properly cleaned between shutdown and resume. This causes the test agent to fail to start occasionally.