Added support for checking testhost compatibility with test sessions#4199

MarcoRossignoli merged 2 commits intomicrosoft:mainmicrosoft/vstest:mainfrom

cvpoienaru:dev/copoiena/test-session-support-for-testhostscvpoienaru/vstest:dev/copoiena/test-session-support-for-testhostsCopy head branch name to clipboard