Stomp-py

* New binary_mode param on WS connections (https://github.com/jasonrbriggs/stomp.py/pull/419)
* Correct WSTransport.receive output (https://github.com/jasonrbriggs/stomp.py/pull/422)

* Change version from tuple to string
* Docker file updates to fix vulnerabilities
* Exception handling fix for websocket connections
* Fix to use the defined timeout during the websocket connection

* Remove ssl expiration check as per PR: https://github.com/jasonrbriggs/stomp.py/pull/380
* Change deprecated PROTOCOL_TLS to PROTOCOL_TLS_CLIENT
* Mock dns responses for testing: https://github.com/jasonrbriggs/stomp.py/pull/383/
* Support for connection over websocket: https://github.com/jasonrbriggs/stomp.py/pull/395
* Add default arg for try_setsockopt (https://github.com/jasonrbriggs/stomp.py/issues/391)
* Updating log levels (https://github.com/jasonrbriggs/stomp.py/pull/401)
* General tidy up of log messages

* Change code to use cryptography lib rather than PyOpenSSL (which is not recommended for use any more - discussed here: https://github.com/jasonrbriggs/stomp.py/issues/378)

* Add support for backwards compatible CONNECT in 1.1 and 1.2 protocols (https://github.com/jasonrbriggs/stomp.py/pull/348)
* Flip DEFAULT_SSL_VERSION to use ssl.PROTOCOL_TLS rather than ssl.PROTOCOL_TLSv1
* Check SSL certificate for expiry if PyOpenSSL is installed
* Remove deprecated constructor params (use_ssl, and other ssl params)
* Minor cleanup (remove debian packaging config, since it didn't work any more)
* Add log_to_stdout method to force command line logging to stdout (useful for testing)
* Various updates for docker testing
* Add mac keepalive functionality
* Minor update to daemon attribute (https://github.com/jasonrbriggs/stomp.py/pull/361)
* Fix issue with heartbeat listener disconnecting the socket (https://github.com/jasonrbriggs/stomp.py/issues/219 - https://github.com/jasonrbriggs/stomp.py/pull/369)