20c1402 backend: prioritize all non-background jobs

2 files Authored by praiskup 3 years ago, Committed by praiskup 3 years ago,
    backend: prioritize all non-background jobs
    
    Previously we prioritized all SRPM (even background) tasks, rather than
    normal (non-background) tasks.  After testing this for some time (about
    a month) in production it seems like a slightly better and more fair
    variant.  This topic was discussed e.g. in #817 #1295.