BZ #1123312 - increase galera pacemaker start timeout

https://bugzilla.redhat.com/show_bug.cgi?id=1123312

Increase galera start timeout to allow a sufficient amount
of time for syncing to occur between galera modes.
BZ #1129227 - Set l3 external_network_bridge to ''.

https://bugzilla.redhat.com/show_bug.cgi?id=1129227

This is needed to properly use provider networks in newer versions of neutron.
Merge pull request #347 from cwolferh/bz1123312_galera_op_start_timeout

BZ #1123312 - increase galera pacemaker start timeout
Merge pull request #348 from jguiditta/bz1129227-br-ex

BZ #1129227 - Set l3 external_network_bridge to ''.
BZ #1128457 - Horizon dashboard -> Not Found

https://bugzilla.redhat.com/show_bug.cgi?id=1128457

Fix 404 on horizon dashboard.

Same fix as posted for packstack (thanks ichavero):
https://bugzilla.redhat.com/show_bug.cgi?id=1129379
https://review.openstack.org/#/c/113592
Merge pull request #350 from cwolferh/bz1128457_apache_fqdn_fix

BZ #1128457 - Horizon dashboard -> Not Found
BZ #1123301 - nova-metadata VIP/listener is missing on port 8775 in haproxy.cfg

https://bugzilla.redhat.com/show_bug.cgi?id=1123301

This was already in the puppet, but had been disabled for a previous release.
This patch re-enables it to see if it now works as expected.
BZ #1123301 - add metadata_listen param

https://bugzilla.redhat.com/show_bug.cgi?id=1123301

Otherwise openstack-nova-api attempts to listen on 0.0.0.0,
causing the error:

ERROR nova.wsgi [-] Could not bind to 0.0.0.0:8775
CRITICAL nova [-] error: [Errno 98] Address already in use

(cherry picked from commit 73a342aeabb03d66d7a26e508183c90ddf72f468)