Add dotnet-svcutil-lib.Tests project and test baseline files. (#4271)

* Add dotnet-svcutil-lib.Tests project and test baseline files.

* Reduce commented code; add reverted test in #4290 for MSBuildProjTests.

* Fix test issue when Console.SetOut to StreamWriter.

* Test baseline update, test fix.

dotnet-svcutil.sln

@@ -7,24 +7,26 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "dotnet-svcutil-lib", "src\d
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "dotnet-svcutil", "src\dotnet-svcutil\src\dotnet-svcutil.csproj", "{E4006BB6-E8C1-44AA-B7BE-16D1CEB05EDE}"
 EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "dotnet-svcutil-lib.Tests", "src\dotnet-svcutil\lib\tests\src\dotnet-svcutil-lib.Tests.csproj", "{41376AC5-871E-4CAB-BCF9-1D5CD3351A90}"
+EndProject
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