Handle rpmdb open errors by throwing out the root candidate (#723167).
    (clumens)
    Check if the potential dep is in done, not the leaf. (#728891) (dlehman)
    Don't crash when checking unpartitioned devices for disklabel. (#720070)
    (dlehman)
    Remove "-Alpha" or "-Beta" from yum's $releasever (#728868). (clumens)