PROTON-1230: Set up SASL environment for C++ tests
PROTON-1230: Set up SASL environment for C++ tests

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