Undo re-targeting tests to netcoreapp2.1
Undo re-targeting tests to netcoreapp2.1

mconnew/wcf,imcarolwang/wcf,StephenBonikowsky/wcf,dotnet/wcf,StephenBonikowsky/wcf,mconnew/wcf,imcarolwang/wcf,imcarolwang/wcf,dotnet/wcf,mconnew/wcf,dotnet/wcf