add logrotate script

now that we removed logrotation from core, we can use standard logrotate
to rotate logs into the archive. Better not compress them and keep em for
10 years.
After rotation, send a USR1 signal so naemon can send broker events for backwards
compatibility.

Signed-off-by: Sven Nierlein <sven@consol.de>
Merge remote branch 'upstream/master'