Modifying the SNI identity package to pick up the new SNI package names.

[saurabh500]

Addresses https://github.com/dotnet/corefx/issues/19154

SNI supports RIDs win-{arch}
This led to package changes for preview1. The updated packages on myget are
runtime.win-x86.runtime.native.System.Data.SqlClient.sni.4.4.0-preview1-25301-01.nupkg
runtime.win-x64.runtime.native.System.Data.SqlClient.sni.4.4.0-preview1-25301-01.nupkg
runtime.win-arm64.runtime.native.System.Data.SqlClient.sni.4.4.0-preview1-25301-01.nupkg

[Petermarcu]

@dotnet-bot Test Innerloop OSX10.12 Release x64 Build and Test please

[saurabh500]

@dotnet-bot Test Innerloop OSX10.12 Release x64 Build and Test please
(There was an I/O error during the build. This could be caused by a hung process on the target machine, preventing it from cleaning up the workspace, or other issues, such as low disk space.)

[saurabh500]

@dotnet-bot Test Innerloop CentOS7.1 Debug x64 Build and Test please
(There was an error processing the xunit test results: [xUnit] [ERROR] - No test reports found for the metric 'xUnit.Net' with the resolved pattern 'bin/**/testResults.xml'. Configuration error?.)