Add a flag to rabbitmq so that we can deploy with ha-mode: all again
Add a flag to rabbitmq so that we can deploy with ha-mode: all again

In change Ib62001c03e1e08f58cf0c6e0ba07a8879a584084 we switched the
rabbitmq queues HA mode from ha-all to ha-exactly. While this gives us a
nice performance boost with rabbitmq, it makes rabbit less resilient to
network glitches as we painfully found out via
https://bugzilla.redhat.com/show_bug.cgi?id=1441635.

Will propose another THT change to actually change the default to
-1 so we get this ha-mode:all by default.

Change-Id: I9a90e71094b8d8d58b5be0a45a2979701b0ac21c
Partial-Bug: #1686337
Co-Authored-By: Damien Ciabrini <942bbc88ca01e4cd9cd3f5722e0ee4231cf11149@redhat.com>
Co-Authored-By: John Eckersberg <fce325d9bea9824893a19b950fc06b32172551f5@redhat.com>

openstack/puppet-tripleo,openstack/puppet-tripleo,openstack/puppet-tripleo