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
Merge "VMware vCenter full scale HA support"