Merge in 'release/2.2' changes

Author: dotnet-bot

buildpipeline/pipeline.json

@@ -55,7 +55,7 @@
             "PB_BuildArguments": "-buildArch=x64 -$(PB_ConfigurationGroup) -stripSymbols -RuntimeOS=linux-musl -- /p:PortableBuild=false /p:StabilizePackageVersion=$(PB_IsStable) /p:PackageVersionStamp=$(PB_VersionStamp)",
             "PB_BuildTestsArguments": "-buildArch=x64 -$(PB_ConfigurationGroup) -SkipTests -Outerloop -RuntimeOS=linux-musl -- /p:ArchiveTests=true /p:EnableDumpling=true /p:PortableBuild=false",
             "PB_SyncArguments": "-p -BuildTests=false -RuntimeOS=linux-musl -- /p:ArchGroup=x64 /p:PortableBuild=false /p:DotNetRestoreSources=$(PB_RestoreSource) /p:DotNetAssetRootUrl=$(PB_AssetRootUrl)",
-            "PB_TargetQueue": "(Alpine.39.Amd64.Open)ubuntu.1604.amd64.open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.9-helix-09ca40b-20190508143246",
+            "PB_TargetQueue": "(Alpine.39.Amd64)[email protected]/dotnet-buildtools/prereqs:alpine-3.9-helix-09ca40b-20190508143246",
             "PB_CreateHelixArguments": "/p:ArchGroup=x64 /p:ConfigurationGroup=$(PB_ConfigurationGroup) /p:TestProduct=corefx /p:TimeoutInSeconds=1200 /p:TargetOS=Linux"
           },
           "ReportingParameters": {