Add shared attribute to address groups for RBAC
Add shared attribute to address groups for RBAC

In order to be able to share address groups with 'access_as_shared' RBAC
policies, the 'shared' attribute is added to their API definition.

Change-Id: I3b82ffe4fa41f1b57ffbad88a86455930bdf1b32

openstack/neutron-lib,openstack/neutron-lib,openstack/neutron-lib,openstack/neutron-lib