LU-1330 proc: remove osd proc handlers from lprocfs_status.c

LU-1330 proc: remove osd proc handlers from lprocfs_status.c

Move lprocfs_osd_rd_{blksize,{files,kbytes}{free,avail} to dt_object.c
and rename them to lprocfs_dt_rd_blksize....  Remove the unused
function lprocfs_obd_rd_mntdev().  Do not include
lustre_{fsfilt,log,disk}.h or dt_object.h in lprocfs_status.c.

Signed-off-by: John L. Hammond <john.hammond@intel.com>
Change-Id: Ic54973f8bc6ec1d440fa76aadf0dd13629ce345c
Reviewed-on: http://review.whamcloud.com/5721
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>