p.conf.pejecevic: squeeze-bpo-sloppy needs packages from squeeze-bpo

Signed-off-by: Andreas Beckmann <anbe@debian.org>
p.conf.pejacevic: adjust timings

reschedule stale reverved packages after 24 hours
reschedule untestable packages after 4 days
run detect_{piuparts,network}_issues every 6 hours

Signed-off-by: Andreas Beckmann <anbe@debian.org>