Fix mono/OSX build - missing `Microsoft.DotNet.BuildTools.TestSuite`
Fix mono/OSX build - missing `Microsoft.DotNet.BuildTools.TestSuite`

.. nuget . This can be seen if you clean the global/user and local nuget
cache and then build:

  Microsoft.Build.Framework -> /Users/ankit/dev/msbuild/bin/x86/OSX/Debug-MONO/Output/Microsoft.Build.Framework.dll
MSBUILD : error : The package Microsoft.DotNet.BuildTools.TestSuite with version 1.0.0-prerelease-00508-01 could not be found in /Users/ankit/.nuget/packages. Run a NuGet package restore to download the package. [/Users/ankit/dev/msbuild/targets/DeployDependencies.proj]

cdmihai/msbuild,Microsoft/msbuild,cdmihai/msbuild,rainersigwald/msbuild,chipitsine/msbuild,mono/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild,Microsoft/msbuild,rainersigwald/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,chipitsine/msbuild,chipitsine/msbuild,mono/msbuild,jeffkl/msbuild,rainersigwald/msbuild,Microsoft/msbuild,AndyGerlicher/msbuild,mono/msbuild,AndyGerlicher/msbuild,AndyGerlicher/msbuild,mono/msbuild,chipitsine/msbuild,sean-gilliam/msbuild,jeffkl/msbuild,cdmihai/msbuild,Microsoft/msbuild,jeffkl/msbuild,jeffkl/msbuild