remove fenari from mw-installation dsh group

.. to see the dsh group monitoring in action

.. and because it should be shutdown soon anyways,
   and start the discussion if it really still needs to
   have a mediawiki on it. i know there was a reason, but
   what was it again?

Change-Id: I7b42f21174b35f7fda6d4a01b9321703bd12a621
Merge "remove fenari from mw-installation dsh group" into production