LU-4929 lfs: Add lfs dirstripe to the manpage

LU-4929 lfs: Add lfs dirstripe to the manpage

Add lfs-setdirstripe.1, lfs-getdirstripe and
lfs-mkdir.1 to the manpage.

Add -m mode to "lfs mkdir" help, and also mention lfs
setdirstripe can only be done on MDT0 with adminitrator
right.

lfs getdirstripe should honor -O MDTUUID to list the
stripe information of subdirectories located on that MDT.

Remove unnecessary error message in cb_getstripe.

Fix the default getdirstripe behavior, which should list all of
its subdirectories stripe pattern, like lfs getstripe.

Fix format of LMV stripe information.

Change-Id: I7ee6ef3d6df5df50e35f5874a27e176884d79704
Signed-off-by: Wang Di <di.wang@intel.com>
Reviewed-on: http://review.whamcloud.com/10643
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>