Openfire 3.9.2 is throwing a ConcurrentModificationException when using the
"kick" button in the admin panel to remove a user from a group
chat room.

This patch fixes the exception by working off a copy of the list.
You can merge this Pull Request by running:

git pull https://github.com/zzglitch/Openfire localmucroom-patch-2

Or you can view, comment on it, or merge it online at:

https://github.com/igniterealtime/Openfire/pull/10