(dsccommunity#565) Remove Deprecated Images

Microsoft is deprecating some images from the hosted runner image pool,
including `'win1803`. This change removes that image in favor of
`vs2017-win2016` as per

https://devblogs.microsoft.com/devops/removing-older-images-in-azure-pipelines-hosted-pools/

azure-pipelines.yml

@@ -47,7 +47,7 @@ stages:
       - job: Test_HQRM
         displayName: 'HQRM'
         pool:
-          vmImage: 'win1803'
+          vmImage: 'vs2017-win2016'
         timeoutInMinutes: 0
         steps:
           - task: DownloadBuildArtifacts@0