Add .gitreview setup.
Add .gitreview setup.

Change-Id: I22855e7f3c77984ffc81ebf00e62cb78839e63a7

rdo-management/tripleo-heat-templates,trozet/opnfv-tht,wyg3958/tripleo-heat-templates,redhat-openstack/tripleo-heat-templates,wyg3958/tripleo-heat-templates,rdo-management/tripleo-heat-templates,openstack/tripleo-heat-templates,trozet/opnfv-tht,redhat-openstack/tripleo-heat-templates,bcrochet/tripleo-heat-templates,openstack/tripleo-heat-templates,trozet/tripleo-heat-templates,trozet/tripleo-heat-templates,dprince/tripleo-heat-templates,trozet/opnfv-tht,bcrochet/tripleo-heat-templates,dprince/tripleo-heat-templates,bcrochet/tripleo-heat-templates