[corosync/pacemaker] Collect corosync-cfgtool -s output / add Pacemaker support

This patch improves HA clustering information gathering adding a new a
new plugin for Pacemaker.

Signed-off-by: Felipe Reyes <felipe.reyes@canonical.com>
Signed-off-by: Adam Stokes <adam.stokes@ubuntu.com>
[openshift] Collect additional config files

Collect additional node web routing configuration files
from the rewrite and vhost frontends, and node district
information.

Fixes RHBZ#1166874

Signed-off-by: Pep Turró Mauri <pep@redhat.com>