Run pcs command only if the pacemaker service is active

This patch checks first if the pacemaker service is active on the Controller
before to run 'pcs status xml' command. This will avoid the validation to fail
miserably on a non-HA deployment.

Change-Id: I10e5d11f929f3b0fce02d5e82437aca9d35cf271
Signed-off-by: Gael Chamoulaud <gchamoul@redhat.com>
(cherry picked from commit 216788c320)

validations/pacemaker-status.yaml

@@ -12,10 +12,19 @@
       groups:
         - post-deployment
   tasks:
-  - name: Get pacemaker status
-    become: true
-    command: pcs status xml
-    register: pcs_status
+  - name: Check pacemaker service is running
+    become: True
+    command: "/usr/bin/systemctl show pacemaker --property ActiveState"
+    register: check_service
     changed_when: False
-  - name: Check pacemaker status
-    pacemaker: status="{{ pcs_status.stdout }}"
+    ignore_errors: True
+
+  - when: "check_service.stdout == 'ActiveState=active'"
+    block:
+      - name: Get pacemaker status
+        become: true
+        command: pcs status xml
+        register: pcs_status
+        changed_when: False
+      - name: Check pacemaker status
+        pacemaker: status="{{ pcs_status.stdout }}"