NO-JIRA: Remove VS2017 build from azure CI
NO-JIRA: Remove VS2017 build from azure CI

The image it uses has been removed.

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