fsck.gfs2: Recognize partially gfs2-converted dinodes
    
    In testing fsck.gfs2 I noticed that if a file system had some
    leftover gfs2 dinodes (due to an interrupted gfs2_convert or
    in my case, because I had previously loaded gfs2 metadata that
    left gfs2 blocks laying around the gfs1 file system) those gfs2
    dinodes were not properly processed.  In particular, it would not
    recognize gfs2-style directories as directories because of the
    difference in where dinode mode information is kept.  This patch
    gives fsck.gfs2 the ability to correctly identify gfs2 dinodes
    when checking a gfs1 file system.
    
    rhbz#675723