Remove dotnet-sdk 2.1.400, remove dotnet-runtime 2.1.1 [#160141823]
Remove dotnet-sdk 2.1.400, remove dotnet-runtime 2.1.1 [#160141823]

Co-authored-by: Andrew Meyer <8f92422f5861fc9f31873f75dd770facd670512b@pivotal.io>

cloudfoundry-community/asp.net5-buildpack