Fix reload service when config updated

service.enabled can be used with watch_in. This patch fixes that
and use service.running.

There is an example of error when applying state:
----------
          ID: opencontrail_compute_services
    Function: service.enabled
        Name: supervisor-vrouter
      Result: False
     Comment: Unable to trigger watch for service.enabled
     Started: 10:40:25.445146
    Duration: 0.785 ms
     Changes:

Change-Id: Id0745ebb3ac08f8bedae3b7d74797831213105ff
diff --git a/opencontrail/compute.sls b/opencontrail/compute.sls
index 7df9d2b..37ef69f 100644
--- a/opencontrail/compute.sls
+++ b/opencontrail/compute.sls
@@ -152,7 +152,7 @@
 {%- endif %}
 
 opencontrail_compute_services:
-  service.enabled:
+  service.running:
   - names: {{ compute.services }}
   {%- if grains.get('noservices') %}
   - onlyif: /bin/false