LU-307 Send parent FID from client to MDS on NFS open for striping info

LU-307 Send parent FID from client to MDS on NFS open for striping info

Which is useful for delay created cases. and it is mainly for Lustre re-export
through NFS. If client does not give such hint, MDS will try to find parent by
the first fid in the link EA. Another fixes are about the protection of delay
creating OSTs objects concurrently.

Change-Id: I5dd72e0452303ca5ab7bff035ff85f83b5862d66
Signed-off-by: nasf <yong.fan@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/557
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Hudson
Reviewed-by: wangdi <di.wang@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>