Comment 1 for bug 1241042

I've tried the attached patch

Note I had to put in a sleep before the call to "neutron agent-list" in order to wait for the DHCP agent to become available, then when
neutron dhcp-agent-network-add 679d2a45-c48b-4a5d-9e5d-652114b48f0d ctlplane

ran it failed with the error
409-{u'NeutronError': {u'message': u'The network 9257ab5f-a3dd-47d9-abc9-c1970d485eb6 has been already hosted by the DHCP Agent 679d2a45-c48b-4a5d-9e5d-652114b48f0d.', u'type': u'NetworkHostedByDHCPAgent', u'detail': u''}}

Finally when the overcloud booted up it couldn't connect to a PXE server.