LU-1445 ofd: Add fid support on OFD

1. Init fid server related structure in OFD, which will
become a sequence metaserver, i.e. MDT will request sequence
from OST(OFD), OFD will request super sequence from MDT0

2. OST FID sequence width will be 4 billion, which is different
with MDS FID.

Change-Id: If861cf5814ea77ce72464525a8de71ac182d742c
Signed-off-by: Wang Di <di.wang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/4326
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
LU-1187 tests: Add dne specific tests to sanityN

1. Change mkdir to test_mkdir for DNE.
2. 2f: Check attr and ownder update under remote dir.
3. 25b: Acl checking under remote dir.
4. 33b: commit on share under remote dir.
5. 4[0-7]: Check remote dir with pdir lock.
6. 70: cd dir and rm -rf dir.

Change-Id: I9b752d8663287db55bd07a5ce132c397749ade4d
Signed-off-by: Wang Di <di.wang@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/4366
Tested-by: Hudson
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>