PROTON-1564: fix ref counting and pconnection binding thread safety for pconnection setup and teardown
PROTON-1564: fix ref counting and pconnection binding thread safety for pconnection setup and teardown

alanconway/qpid-proton,gemmellr/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,kgiusti/qpid-proton,alanconway/qpid-proton,astitcher/qpid-proton,alanconway/qpid-proton,ChugR/qpid-proton,astitcher/qpid-proton,astitcher/qpid-proton,alanconway/qpid-proton,apache/qpid-proton,kgiusti/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,ChugR/qpid-proton,ChugR/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,gemmellr/qpid-proton,apache/qpid-proton,ssorj/qpid-proton,kgiusti/qpid-proton,apache/qpid-proton,apache/qpid-proton,apache/qpid-proton,apache/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,gemmellr/qpid-proton,astitcher/qpid-proton,alanconway/qpid-proton,ChugR/qpid-proton,ssorj/qpid-proton,alanconway/qpid-proton