Add listener_port to provision_instance

API changes
- cannot change peers or enable
peers_from_control_nodes on VM deployments
- allow setting ip_address
- use ip_address over hostname in the generated
group_vars/all.yml
- Drop api/v2/peers endpoint

DB changes
- add ip_address unique constraint, but ignore "" entries

Other changes
- provision_instance should take listener_port option

Tests
- test that new controls doesn't disturb other peers
relationships
- test ip_address over hostname

awx/api/views/__init__.py

@@ -341,10 +341,8 @@ class InstanceDetail(RetrieveUpdateAPIView):
 
     def update_raw_data(self, data):
         # these fields are only valid on creation of an instance, so they unwanted on detail view
-        data.pop('listener_port', None)
         data.pop('node_type', None)
         data.pop('hostname', None)
-        data.pop('ip_address', None)
         return super(InstanceDetail, self).update_raw_data(data)
 
     def update(self, request, *args, **kwargs):