Remove unnecessary content from the common project.json in 2.1.
Remove unnecessary content from the common project.json in 2.1.

* Since we are currently only building and running for ns2.0 and everything else is being harvested we don't need several sections.

StephenBonikowsky/wcf,mconnew/wcf,mconnew/wcf,mconnew/wcf,imcarolwang/wcf,ericstj/wcf,imcarolwang/wcf,ElJerry/wcf,zhenlan/wcf,hongdai/wcf,imcarolwang/wcf,dotnet/wcf,KKhurin/wcf,KKhurin/wcf,dotnet/wcf,ericstj/wcf,StephenBonikowsky/wcf,ElJerry/wcf,dotnet/wcf,zhenlan/wcf,hongdai/wcf