Add flag to push to refs/for/* for compatibilty.
Add flag to push to refs/for/* for compatibilty.

Fixes bug #1005101

Versions of Gerrit < 2.3 do not support pushing to the refs/publish/*
ref. Add a flag to allow users of older version of Gerrit to push to
the deprecated refs/for/* ref.

Change-Id: Iff268c594b9e6d9b7c81b86b91f74f47395ee3b1

openstack-infra/git-review,ka2m/git-review,meelapshah/git-review,meelapshah/git-review,jeeloo/git-review,entropia1/git-review