Add .gitreview file to support the git-review tool.
Add .gitreview file to support the git-review tool.

Change-Id: I4c518e985a7c24b1d41789f13f73bf069e6b1fbd

openstack-attic/melange,openstack-attic/melange,rackerlabs/melange,openstack-attic/melange,rackerlabs/melange,rajarammallya/melange,rajarammallya/melange,rajarammallya/melange,rackerlabs/melange