LU-9052 lod: accept lfs mkdir from old client

LU-9052 lod: accept lfs mkdir from old client

MDS should also accept create striped directory request
from old client, but it will only honour stripe index in
this case, since the old client can only create remote
directory.

And also move the magic check from LOD to MDD to validate
LMV as early as possible.

Directory creation for echo client should go with lmv_user_md,
otherwise validation on user md will fail.

For striped directory, echo client should first choose stripe
before MD operation.

And also remove some unecessary lmv audit.

Re-enable 225b tests for DNE to test echo operations on
striped directory.

In mds-survey, if the current environment has more than one MDS,
let's skip the test. Because echo test will attach echo_client
individually on each MDSs(all of MDDs on the MDS), so each echo
client will not be able to access all of MDTs. But the test will
create a striped dir by MAX MDS count internally in mds_survey,
so echo client can not resolve the directory path in this case.

Signed-off-by: Di Wang <di.wang@intel.com>
Change-Id: I74a3712edfa36fd178f92965f8e35f5ff77ad422
Reviewed-on: https://review.whamcloud.com/25091
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Fan Yong <fan.yong@intel.com>