Make sure that the data is processed as it is provided by the client. Don't...

Make sure that the data is processed as it is provided by the client. Don't trim the data, as it will lead to very unexpected behavior later in the session (where that data is no longer trimmed). If data is invalid (e.g: spaces before or after the username), return an error. (JM-1481)

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@10840 b35dd754-fafc-0310-a699-88a17e54d16e