Use confext parameter when naming vhost config files.

apache/vhosts/standard.sls

@@ -8,7 +8,7 @@ include:
 {{ id }}:
   file:
     - managed
-    - name: {{ apache.vhostdir }}/{{ id }}
+    - name: {{ apache.vhostdir }}/{{ id }}{{ apache.confext }}
     - source: {{ site.get('template_file', 'salt://apache/vhosts/standard.tmpl') }}
     - template: {{ site.get('template_engine', 'jinja') }}
     - context: