LU-15456 llite: deadlock in ll_new_node()

LU-15456 llite: deadlock in ll_new_node()

ll_new_node() will call ll_dir_getstripe() to fetch parent default
LMV if md_create() returns -EREMOTE, it should call
ll_finish_md_op_data() before calling ll_dir_getstripe() because
the latter will lock lli_lsm_sem again, which will deadlock.

Fixes: 55ca00c3d1cd863 ("LU-11213 ptlrpc: intent_getattr fetches default LMV")
Test-Parameters: mdscount=2 mdtcount=4 testlist=racer,racer,racer
Signed-off-by: Lai Siyao <lai.siyao@whamcloud.com>
Change-Id: Ib858bae19ff88533fe487583c27d544026aafa3f