Add some AM URN to short tag mappings.

www/aptui/instance_defs.php

@@ -36,7 +36,9 @@ $urn_mapping =
           "urn:publicid:IDN+clemson.cloudlab.us+authority+cm"   => "Clem",
           "urn:publicid:IDN+apt.emulab.net+authority+cm"        => "APT",
           "urn:publicid:IDN+emulab.net+authority+cm"            => "MS",
-          "urn:publicid:IDN+utahddc.geniracks.net+authority+cm" => "DDC");
+          "urn:publicid:IDN+utahddc.geniracks.net+authority+cm" => "DDC",
+          "urn:publicid:IDN+stitch.geniracks.net+authority+cm"  => "Stitch",
+          "urn:publicid:IDN+al2s.internet2.edu+authority+cm"    => "AL2S");
 
 $freenodes_mapping =
     array("urn:publicid:IDN+utah.cloudlab.us+authority+cm"      =>