LU-9846 utils: hash may be overridden in 'lfs setdirstripe'

LU-9846 utils: hash may be overridden in 'lfs setdirstripe'

lfs_setdirstripe() may override 'hash' if '-H hash' is specified
before '-i', since LMV doesn't support OVERSTRIPING, this support
can be ignored.

Fixes: 591a9b4cebc5 ("LU-9846 lod: Add overstriping support")

Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: If6db03d2d4f6d208da19ae064fde1d851f01beb4
Reviewed-on: https://review.whamcloud.com/35095
Tested-by: Jenkins
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>