PROTON-1540: [go] disabled race detection by default (again)
PROTON-1540: [go] disabled race detection by default (again)

NOTE: go test -race flag is not included by default, it causes problems on several platforms:
- ubuntu up to trust: link errors
- ubuntu from xenial: requires extra package golang-race-detector-runtime
- fedora with gccgo: complains about "import cycles"
(Works well on fedora with original go)
Enable manually with -DGO_TEST_FLAGS="-v -race"

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