Revert "Write UDP statistics to the log, not just the console (e.g., "show queues")"

Fixes http://opensimulator.org/mantis/view.php?id=7280
It can't be done this way because the stats data needs to show up on the console at all log levels, not just debug.
But this means setting it to log at fatal, which is not appropriate for this stuff in the log.
I understand the desire but this has to be done some other way, perhaps by (yet another) config parameter.
Also, this was already being done with the ClientStatsReport but that also should be done in another way, I think.

This reverts commit 5d534127663899cd5592c865b1d00855fce25854.