Bug 629681 - Retro Changelog trimming does not behave as expected
    
    https://bugzilla.redhat.com/show_bug.cgi?id=629681
    
    Description: As reporter Oliver Thalmann (oliver.thalmann@chuv.ch)
    pointed out, retrocl_init_trimming was repeating the retrocl_
    housekeeping event every 5000 minutes instead of 5 minutes.
    This patch fixes it to 5 minutes.