Parses the udp4 statistics from opentracker.
Args: $self, $payload
Decodes the plain text data retrieved from the udp4 statistics of opentracker.
The payload looks like this (no indentation): 0 0 32082 seconds (8 hours) opentracker udp4 stats, 0 conns/s :: 0 success/s.
Knut-Olav Hoven, <firstname.lastname@example.org>
Copyright (C) 2009 by Knut-Olav Hoven
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.