Add haproxy_stats to the haproxy config

* Enables statistics page to monitor haproxy status
* Prevent haproxy from failing to start if there
  are no cfg includes present

Change-Id: I055811107bf959dc156448f9a5a457fb2d569d3f
Closes-Bug: 1337261
VMware vCenter full scale HA support

- introduce new flag 'ha_mode' in vmware class that allows us enable HA
- apply 'vmware' class to all controllers, not only primary controller
- add OCF scripts for nova-compute and nova-network services
- stop nova-compute and nova-network services and disable their startup
  during system boot
- create needed pacemaker resources

Change-Id: I2f1863d6895fb8c032c5fd105b29163fff0a82f4
Implements: blueprint vcenter-hv-full-scale-support