Adds HAcluster Ansible role. This role contains High Availability
clustering solution composed of Corosync, Pacemaker and Pacemaker Remote.

HAcluster is added as a helper role for Masakari which requires it for
its host monitoring, allowing to provide HA to instances on a failed
compute host.

Kolla hacluster images merged in [1].

[1] https://review.opendev.org/#/c/668765/



Change-Id: I91e5c1840ace8f567daf462c4eb3ec1f0c503823
Implements: blueprint ansible-pacemaker-support
Co-Authored-By: Radosław Piliszek <radoslaw.piliszek@gmail.com>
Co-Authored-By: Mark Goddard <mark@stackhpc.com>