Clean up downgrade warnings in test-runtime
Clean up downgrade warnings in test-runtime

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