GER-925: Fix Gerrit Installer finding the version.
GER-925: Fix Gerrit Installer finding the version.

needed to completely rework how the gerrit version information is displayed.  this should work just the same on 2.13 as 2.16 by using the "version" command.

Change-Id: Ia29641266a83134b01ab223f7d1b756f360ceaaf
WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit,WANdisco/gerrit