Gerrit: Ensure /opt/lib exists if used
Gerrit: Ensure /opt/lib exists if used

/opt/lib/git is about to become the new default path for the local
replica.  If it is used, we should make sure /opt/lib exists.

Change-Id: I4accdfefce9ef4f98c435c11f08fded1481e3ee6

open-switch/infra_puppet-gerrit,dhiana/puppet-gerrit,dhiana/puppet-gerrit,open-switch/infra_puppet-gerrit,open-switch/infra_puppet-gerrit,dhiana/puppet-gerrit