BZ #1125301 - Add heat-engine to cloudwatch colo constraint

Do not merge yet. Still needs testing. Want feedback.
I changed this back to 'openstack-heat-api-cloudwatch-clone' because that is the name of the pacemaker resource, and this worked as expected, so if you can amend this patch we can merge.  Output from pcs constraint:

```
Ordering Constraints:
  start fs-varlibglanceimages-clone then start openstack-glance-registry-clone
  start openstack-glance-registry-clone then start openstack-glance-api-clone
  start openstack-nova-consoleauth-clone then start openstack-nova-novncproxy-clone
  start openstack-nova-novncproxy-clone then start openstack-nova-api-clone
  start openstack-nova-api-clone then start openstack-nova-scheduler-clone
  start openstack-nova-scheduler-clone then start openstack-nova-conductor-clone
  start openstack-cinder-scheduler-clone then start openstack-cinder-volume-clone
  start neutron-ovs-cleanup then start neutron-netns-cleanup
  start neutron-netns-cleanup then start neutron-agents
  start neutron-openvswitch-agent then start neutron-dhcp-agent
  start neutron-openvswitch-agent then start neutron-l3-agent
  start neutron-openvswitch-agent then start neutron-metadata-agent
  start openstack-cinder-api-clone then start openstack-cinder-scheduler-clone
  start openstack-heat-api-clone then start openstack-heat-api-cfn-clone
  start openstack-heat-api-cfn-clone then start openstack-heat-api-cloudwatch-clone
  start openstack-heat-api-cloudwatch-clone then start openstack-heat-engine
Colocation Constraints:
  openstack-glance-registry-clone with fs-varlibglanceimages-clone
  openstack-glance-api-clone with openstack-glance-registry-clone
  openstack-nova-novncproxy-clone with openstack-nova-consoleauth-clone
  openstack-nova-api-clone with openstack-nova-novncproxy-clone
  openstack-nova-scheduler-clone with openstack-nova-api-clone
  openstack-nova-scheduler-clone with openstack-nova-conductor-clone
  openstack-cinder-volume-clone with openstack-cinder-scheduler-clone
  neutron-dhcp-agent with neutron-openvswitch-agent
  neutron-l3-agent with neutron-openvswitch-agent
  neutron-metadata-agent with neutron-openvswitch-agent
  neutron-netns-cleanup with neutron-ovs-cleanup
  neutron-agents with neutron-netns-cleanup
  openstack-cinder-scheduler-clone with openstack-cinder-api-clone
  openstack-heat-api-cfn-clone with openstack-heat-api-clone
  openstack-heat-api-cloudwatch-clone with openstack-heat-api-cfn-clone
  openstack-heat-engine with openstack-heat-api-cloudwatch-clone
```