Bug 15240: Do not process issues with a date due later than today

 Bug 15240: Do not process issues with a date due later than today

There is no need to do this job in Perl, MySQL could do it instead.
The idea is to only retrieve the issues info which could be overdued.

To test:
1/ Run the script
2/ Apply the patch
3/ Run the script again, notice the exact same results but execution time is faster

Signed-off-by: Chris Cormack <chrisc@catalyst.net.nz>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Brendan A Gallagher <brendan@bywatersolutions.com>