Add pacemaker and corosync as tripleo elements

corosync+pacemaker is working approach to handle active/passive
cluster resources.

It will be usefull atleast for:
1. neutron l3 agent
2. neutron lbaas agent
3. vip interface for haproxy
4. qpid ha setup

Related to blueprint tripleo-icehouse-ha-production-configuration

Change-Id: I660d8a4a8e3a4eacf5e2b63d323fa5b575316cdd
Merge "Add pacemaker and corosync as tripleo elements"