Disable push to myget (dotnet#3157)

Author: shauheen

Diff for: build/vsts-ci.yml

@@ -236,12 +236,12 @@ phases:
       nuGetFeedType: internal 
       feedPublish: MachineLearning
 
-  - task: MSBuild@1
-    displayName: Publish Packages to MyGet Feed
-    inputs:
-      solution: build/publish.proj
-      msbuildArguments: /t:PublishPackages /p:NuGetFeedUrl=$(_NuGetFeedUrl) /p:NuGetApiKey=$(dotnet-myget-org-api-key)
-      msbuildVersion: 15.0
+  # - task: MSBuild@1
+  #   displayName: Publish Packages to MyGet Feed
+  #   inputs:
+  #     solution: build/publish.proj
+  #     msbuildArguments: /t:PublishPackages /p:NuGetFeedUrl=$(_NuGetFeedUrl) /p:NuGetApiKey=$(dotnet-myget-org-api-key)
+  #     msbuildVersion: 15.0
 
   - task: MSBuild@1
     displayName: Publish Symbols to SymWeb Symbol Server