Fix broken playbooks

Turns out that assert cannot be used in a task list.  Changed the use of
assert to the fail module.

Change-Id: If9665a9bd21645d48d0ae67bd6118da88a8b1c93

playbooks/galera_status.yml

@@ -1,8 +1,8 @@
 - name: Fetch Galera sync status from MySQL
-  sudo: yes # Necessary since root is granted access
+  sudo: yes
   command: mysql -N -e "SHOW STATUS LIKE 'wsrep_local_state'"
   register: wsrep_local_state
 - set_fact: galera_status="Synced"
-  when: "{{ wsrep_local_state == 4 }}"
+  when: wsrep_local_state == "4"
 - set_fact: galera_status="Out of Sync"
-  when: "{{ wsrep_local_state != 4 }}"
+  when: wsrep_local_state != "4"

playbooks/update_cloud.yml

@@ -70,16 +70,17 @@
   sudo: yes
   tasks:
     - include: galera_status.yml
-    - assert:
-      that: galera_status == 'Synced'
     - service: name=mysql enabled=no state=stopped
+      when: galera_status == 'Synced'
+    - fail: msg="Galera Replication is out of sync - cannot safely proceed"
+      when: galera_status != 'Synced'
 - hosts: controllermgmt
   name: Stop MySQL on Overcloud Controller Mgmt node
   sudo: yes
   tasks:
     - include: galera_status.yml
-    - assert:
-      that: galera_status == 'Out of Sync'
+    - fail: msg="Galera Replication is out of sync - cannot safely proceed"
+      when: galera_status == 'Out of Sync'
     - service: name=mysql enabled=no state=stopped
 - hosts: undercloud
   name: Rebuild and Refresh Undercloud