fix(running.sls): use watch not require to ensure service restart

* Service isn't restarted if the config file changes
* Made aware of this in the `keepalived-formula`, which was updated to
  this `template-formula` structure
  - saltstack-formulas/keepalived-formula#37
  - saltstack-formulas/keepalived-formula#41
* May need to reconsider: should we really be watching the whole `sls`
  rather than explictly watching each state?

Author: myii

TEMPLATE/service/running.sls

@@ -13,5 +13,5 @@ TEMPLATE-service-running-service-running:
   service.running:
     - name: {{ TEMPLATE.service.name }}
     - enable: True
-    - require:
+    - watch:
       - sls: {{ sls_config_file }}