PROTON-2304: fix epoll proactor hang removing and replacing same canceled timer at front of timers list repeatedly
PROTON-2304: fix epoll proactor hang removing and replacing same canceled timer at front of timers list repeatedly

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