Fix syntax for set_fact module.

Fix issue that arise during upgrade:
 error while evaluating conditional (redis_pcs_res|bool):
  'redis_pcs_res' is undefined

Change-Id: I4298eb1ec2fc0e0c44aa63189cff3962fb06c6bd

docker/services/pacemaker/database/redis.yaml

@@ -366,7 +366,8 @@ outputs:
               ignore_errors: true
               register: redis_pcs_res_result
             - name: Set fact redis_pcs_res
-              set_fact: "{{redis_pcs_res_result|succeeded}}"
+              set_fact:
+                redis_pcs_res: "{{redis_pcs_res_result|succeeded}}"
         - name: redis baremetal to container upgrade tasks
           when:
             - step|int == 1