PROTON-1493: c epoll proactor spinning on interruptfd
PROTON-1493: c epoll proactor spinning on interruptfd

Missing read() on interruptfd was causing the proactor to spin.

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