* moved file gerrit/acls/openstack/chef-cookbooks.config to
gerrit/acls/openstack/openstack-chef.config to adapt to proper project name in
the big tent
* renamed gerrit groups in acl to fit the documented guideline (has yet to be done in
gerrit)
* added permissions for pushSignedTag to new group openstack-chef-release (has
yet to be created in gerrit)
* changed permissions for branch creation from -core to -release group
Change-Id: I7b6d81a85a0ce748b5ade64bf84c5c0c261cdd36