PROTON-1090: fix reactor timer pipe cleanup to prevent 100% cpu spin
PROTON-1090: fix reactor timer pipe cleanup to prevent 100% cpu spin

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