Eng 18234 - Speed up the final kit builds (#6867)
Eng 18234 - Speed up the final kit builds (#6867)

* ENG-18234.  Stop building and storing the old Pro kit.

* ENG-18234. Speed up git cloning for the builds
 - Shallow clone a single branch, if possible
 - Don't checkout pro or rabbitmq repo on the mac

* ENG-18234. Only compile libvoltdb on OSX for inclusion in kit.

* ENG-18234.  Fix review comment and fix build from git hash#.

VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb,VoltDB/voltdb