Restart only installed services

Avoids deployment failure while doing the restart of services when
rsyslog was not installed.

Failure was found while attempting a standalone deployment on a
fresh RHEL8 host.

Change-Id: I286029011e36dd35411987c7918916f8082d885b

deployment/time/timezone-baremetal-ansible.yaml

@@ -48,11 +48,15 @@ outputs:
           timezone:
             name: "{{ timezone }}"
           register: timezone_result
+        - name: Populate service facts
+          service_facts:
         - name: Restart services
+          when:
+            - timezone_result.changed
+            - (item + ".service") in ansible_facts.services
           service:
             name: "{{ item }}"
             state: restarted
           with_items:
             - rsyslog
             - crond
-          when: timezone_result.changed