Allow access to nova-docker stable branches
Allow access to nova-docker stable branches

Enable gerrit review for nova-docker stable branches.
We'll be adding a stable/icehouse branch immediately
and a stable/juno branch, once released.

Change-Id: I28c1d4a6758d36709d6a86d6ca25ca5682f4113b

openstack-infra/project-config,noorul/os-project-config,noorul/os-project-config,open-switch/infra_project-config,Tesora/tesora-project-config,open-switch/infra_project-config,Tesora/tesora-project-config,osrg/project-config,openstack-infra/project-config,citrix-openstack/project-config,dongwenjuan/project-config,coolsvap/project-config,osrg/project-config,anbangr/osci-project-config,citrix-openstack/project-config,coolsvap/project-config,dongwenjuan/project-config,anbangr/osci-project-config