LU-16743 lod: create stripe with correct attr

LU-16743 lod: create stripe with correct attr

lod_xattr_set_lmv() create directory stripe with master object attr,
but it shouldn't change attr->la_valid, otherwise bogus data may be
set on stripe object.

Zfs osd_create() copies attr to object directly, clear la_flags if
LA_FLAGS is not set in la_valid.
_
Test-Parameters: trivial
Test-Parameters: mdscount=2 mdtcount=4 mdtfilesystemtype=zfs testlist=sanity
Test-Parameters: mdscount=2 mdtcount=4 mdtfilesystemtype=zfs testlist=sanity
Test-Parameters: mdscount=2 mdtcount=4 mdtfilesystemtype=zfs testlist=sanity
Test-Parameters: mdscount=2 mdtcount=4 mdtfilesystemtype=zfs testlist=sanity
Test-Parameters: mdscount=2 mdtcount=4 mdtfilesystemtype=zfs testlist=sanity
Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: I8385f36bd2eee0e55cbe6bd031b0e013cda40e06
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52052
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>