BZ #1173730 - allow separation of cluster and management networks

https://bugzilla.redhat.com/show_bug.cgi?id=1173730

Pacemaker and galera may now implement their internal cluster
communication over $pcmk_server_addrs/$pcmk_server_addrs which may be
defined as equivalent to or different from the management network
(defined by $lb_backend_server_addrs/$lb_backend_server_names).
Merge pull request #430 from cwolferh/pacemaker_gets_its_own_network

BZ #1173730 - pacemaker traffic optionally on a different network
BZ #1174487 - default galera ssl setting to true

https://bugzilla.redhat.com/show_bug.cgi?id=1174487

Galera should use ssl for internal cluster sync operations by default.