staging: lustre: lmv: allow cross-MDT rename and link

Remove checks for cross-MDT operation, so cross-MDT
rename and link will be allowed.

Remove obsolete locality parameters in MDT lock API after all of
cross-MDT operations are allowed.

This is the client side changed only so the upstream
client can support this.

Signed-off-by: wang di <di.wang@intel.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3537
Reviewed-on: http://review.whamcloud.com/12282


Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>