Parses the renew statistics from opentracker.
Args: $self, $payload
Decodes the plain text data retrieved from the renew statistics of opentracker.
The payload looks like this (no indentation): 00 51 01 79 02 69 03 80 ... 41 0 42 1 43 2 44 3
Knut-Olav Hoven, <email@example.com>
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.