PROTON-2443: Workaround bug in cyrus sasl EXTERNAL mechanism
PROTON-2443: Workaround bug in cyrus sasl EXTERNAL mechanism

The mechanism plugin assumes that the initial iresponse data is zero
terminated. But this is not required by the protocol or by the API used
by cyrus sasl.

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