Adding support for these two latest versions of OSX and Fedora.
Adding support for these two latest versions of OSX and Fedora.

* The VSO build and run process has been updated for these new OS versions but they need to be added as supported RIDs for test runtime.

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