Fix: work properly with koji prod and stg profile
    
    Besides adding missing dependent packages, also modify subpackage
    fedpkg-stage to require exact fedpkg by N-V-R. That could prevent from
    installing older fedpkg package with same N-V but smaller release
    number. Actually, fedpkg-stage should work with fedpkg that is built
    from same Koji build N-V-R.