Fix Pike/OSP12 IHA cluster wide setting

This commit adds an essential command to the apply steps for the
Instance HA in Pike/OSP12:

    pcs resource defaults requires=fencing

Without this in place once the compute's unfence trigger is created all
the bundle resources are stopped.
By default [1] "requires" meta attribute for each resource is calculated
depending on the status of the other resources. It should be "fencing"
since we have stonith-enabled to true, but since we are creating also a
compute dummy resource with provides=unfencing then it seems that the
requires defaults become "unfencing" too, so we need to explicit set
the default for all the other resources.

[1] http://clusterlabs.org/doc/en-US/Pacemaker/1.1/html-single/Pacemaker_Explained/#_resource_meta_attributes

Change-Id: I3a93c3c8ecf9bb9e4d2fb1ca2cecaf777e7547aa

roles/instance-ha/tasks/apply.yml

@@ -252,6 +252,10 @@
           pcs stonith show ipmilan-{{ hostvars[item]['ansible_hostname'] }}
       with_items: "{{ groups['compute'] }}"
 
+    - name: Set requires to fencing as default for all resources (Pike/RHOS-12)
+      shell: "pcs resource defaults requires=fencing"
+      when: release in [ 'pike', 'rhos-12' ]
+
     - name: Create fence-nova pacemaker resource
       shell: "pcs stonith create fence-nova fence_compute auth-url=$OS_AUTH_URL login=$OS_USERNAME passwd=$OS_PASSWORD tenant-name=$OS_TENANT_NAME domain=localdomain record-only=1 --force"
       when: instance_ha_shared_storage|bool and release not in [ 'pike', 'rhos-12' ]
@@ -317,7 +321,7 @@
           - nova-compute
       when: release not in [ 'pike', 'rhos-12' ]
 
-    - name: Create dummy compute unfence trigger (Pike/RHOS-12)
+    - name: Create compute unfence resource to override default resource requires (Pike/RHOS-12)
       shell: |
         pcs resource create compute-unfence-trigger ocf:pacemaker:Dummy op start requires="unfencing" --clone --disabled
         pcs constraint location compute-unfence-trigger-clone rule resource-discovery=never score=-INFINITY osprole ne compute