QPID-6117: [Python Client 0-8..0-9] Ignore socket.error ENOTCONN when trying to shutdown a socket to prevent spurious exception when socket closed by peer

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1627553 13f79535-47bb-0310-9956-ffa450edef68
QPID-6116: [Python Client 08..091] Add ability to negotiate SASL mechanism and add pure python implementations for SCRAM/CRAM/PLAIN mechanisms

git-svn-id: https://svn.apache.org/repos/asf/qpid/trunk@1627554 13f79535-47bb-0310-9956-ffa450edef68