LU-883 ldiskfs: drop unused diagnostic information

LU-883 ldiskfs: drop unused diagnostic information

The debug informatin was introduced for diagnosing readonly
issues for bug 16680. It is unused any longer and makes the
console output some noisy. So drop.

Signed-off-by: Fan Yong <yong.fan@whamcloud.com>
Change-Id: If950654d6517f317809bb0de1446e2377a524c77
Reviewed-on: http://review.whamcloud.com/2068
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Bobi Jam <bobijam@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>