adding ipsilon plugin to phabricator configuration

roles/phabricator/templates/local.json.j2

@@ -34,6 +34,10 @@
         "PhabricatorApplicationHarbormaster" : true,
         "PhabricatorApplicationOAuthServer" : true,
         "PhabricatorApplicationPhortune" : true
-        }
+        },
+{% if deployment_type == "qa-stg" %}
+  "load-libraries": {
+    "ipsilonoauth": "/srv/phabricator-extension-ipsilonoauth/src"
+  },
 }