git-gerrit-push: Simplify output from push
git-gerrit-push: Simplify output from push

We do not need to support pushing multiple refspecs.  Just use the push
porcelain directly.

apexdatasolutions/VistA-M,bradking/VistA-M,OSEHRA-Sandbox/VistA-M,ChristopherEdwards/VistA-FOIA,ChristopherEdwards/VistA-FOIA,OSEHRA/VistA-M