Refresh apache on api changes

Currently apache is only restarted when UI code is changed and not
when only API/python code is changed in the RefStack repository.
This patch will notify apache to restart when the API is updated.

Change-Id: Ie3111a3c2b9ee7dd514cf048871e9c820f545bb1

manifests/api.pp

@@ -82,6 +82,7 @@ class refstack::api () {
     refreshonly => true,
     require     => Vcsrepo[$src_api_root],
     subscribe   => Vcsrepo[$src_api_root],
+    notify      => Service['httpd'],
   }
 
   # Migrate the database.