* Gerrit: make the path to the local replica configurable
(default to /var/lib/git)
* Set the local replica path on review-dev to /opt/lib/git
* Gerrit: make the jeepyb cache dir configurable
(default to /opt/lib/jeepyb)
Change-Id: I9b94fa540bb400abcc746c5c962bb3b5e2b372e3