pspush: use unique gerrit name

  AOKP's host is already name gerrit (which should be changed
  as well). Settings a unique host allows for the use of
  pspush on systems with both build env's to coexists
  peacefully.

  Patch Set 2: fix both instances of gerrit name

Signed-off-by: KhasMek <Boushh@gmail.com>
Change-Id: I7cc6f1b764e9ecd743b86986369f568ac8bf2e42