Enable LDAP on the XMPP 5apps.com vhost

Refactor the ejabberd config file to remove hardcoded values about the
vhosts

Refs #123

data_bags/credentials/ejabberd.json

@@ -0,0 +1,10 @@
+{
+  "id": "ejabberd",
+  "5apps_ldap_password": {
+    "encrypted_data": "NjlYL0mMpXmLP2pk1ZSo5mWt+qosx7eh7+duoPc57avQGwPJ6Vxb\n",
+    "iv": "q/py5XYCEXARUEA9\n",
+    "auth_tag": "4xoSjTjLYNzuLvoksf3Thw==\n",
+    "version": 3,
+    "cipher": "aes-256-gcm"
+  }
+}