Work around weird MM mapping for fedora-enchilada.
    
    Mirrormanager wants to see checkins without the directory prefix, but
    for the "fedora-enchilada" module, the rsync module is in "fedora" but
    mirrormanager wants "fedora/linux" to be stripped.  So work up a
    separate associative array to allow mirrormanager to differ.  It's just
    a copy of the regular module->directory mapping, with the entry for
    "fedora-enchilada" changed.