Add CI support for updated run-corefx-tests.py
Add CI support for updated run-corefx-tests.py

Change CI to build a "GenerateLayoutOnly" drop for corefx testing,
specifically to cause the corefx package to be restored, so we
can determine its version.

cshung/coreclr,poizan42/coreclr,yizhang82/coreclr,mmitche/coreclr,poizan42/coreclr,poizan42/coreclr,wtgodbe/coreclr,ruben-ayrapetyan/coreclr,krk/coreclr,krk/coreclr,krk/coreclr,cshung/coreclr,cshung/coreclr,wtgodbe/coreclr,mmitche/coreclr,mmitche/coreclr,ruben-ayrapetyan/coreclr,poizan42/coreclr,krk/coreclr,yizhang82/coreclr,cshung/coreclr,mmitche/coreclr,wtgodbe/coreclr,cshung/coreclr,poizan42/coreclr,mmitche/coreclr,cshung/coreclr,wtgodbe/coreclr,mmitche/coreclr,yizhang82/coreclr,wtgodbe/coreclr,krk/coreclr,ruben-ayrapetyan/coreclr,ruben-ayrapetyan/coreclr,ruben-ayrapetyan/coreclr,wtgodbe/coreclr,yizhang82/coreclr,ruben-ayrapetyan/coreclr,yizhang82/coreclr,yizhang82/coreclr,krk/coreclr,poizan42/coreclr