Follow instructions https://www.redhat.com/archives/rdo-list/2015-April/msg00254.html
packstack fails :-

Applying 192.169.142.127_nova.pp
Applying 192.169.142.137_nova.pp
192.169.142.127_nova.pp:                             [ DONE ]     
192.169.142.137_nova.pp:                          [ ERROR ]       
Applying Puppet manifests                         [ ERROR ]

ERROR : Error appeared during Puppet run: 192.169.142.137_nova.pp
Error: Could not start Service[nova-compute]: Execution of '/usr/bin/systemctl start openstack-nova-compute' returned 1: Job for openstack-nova-compute.service failed. See 'systemctl status openstack-nova-compute.service' and 'journalctl -xn' for details.
You will find full trace in log /var/tmp/packstack/20150501-081745-rIpCIr/manifests/192.169.142.137_nova.pp.log

In both cases (RC2 or CI repos)  on compute node 192.169.142.137 /var/log/nova/nova-compute.log
reports :-

2015-05-01 08:21:41.354 4999 INFO oslo.messaging._drivers.impl_rabbit [req-0ae34524-9ee0-4a87-aa5a-fff5d1999a9c ] Delaying reconnect for 1.0 seconds...
2015-05-01 08:21:42.355 4999 INFO oslo.messaging._drivers.impl_rabbit [req-0ae34524-9ee0-4a87-aa5a-fff5d1999a9c ] Connecting to AMQP server on localhost:5672
2015-05-01 08:21:42.360 4999 ERROR oslo.messaging._drivers.impl_rabbit [req-0ae34524-9ee0-4a87-aa5a-fff5d1999a9c ] AMQP server on localhost:5672 is unreachable: [Errno 111] ECONNREFUSED. Trying again in 11 seconds.

Seems like it is looking for AMQP Server at wrong host . Should be 192.169.142.127
On 192.169.142.127 :-

[root@ip-192-169-142-127 ~]# netstat -lntp | grep 5672
==>  tcp        0      0 0.0.0.0:25672           0.0.0.0:*               LISTEN      14506/beam.smp     
        tcp6       0      0 :::5672                              :::*                    LISTEN      14506/beam.smp  

[root@ip-192-169-142-127 ~]# iptables-save | grep 5672
-A INPUT -s 192.169.142.127/32 -p tcp -m multiport --dports 5671,5672 -m comment --comment "001 amqp incoming amqp_192.169.142.127" -j ACCEPT
-A INPUT -s 192.169.142.137/32 -p tcp -m multiport --dports 5671,5672 -m comment --comment "001 amqp incoming amqp_192.169.142.137" -j ACCEPT

Answer-file is attached

Thanks.
Boris