LU-1445 fid: Add DATA fid type in fid_request.

LU-1445 fid: Add DATA fid type in fid_request.

1. Add data fid type in fid request on client side.
2. When MDT request fids to the OST, if it is not
ready for fid allocation yet. i.e. not being connected
to MDT0 yet, it will return -EINPROGRESS, and MDT will
try again.
3. Remove obsolete obd_fid_init/fini in llite.

Signed-off-by: wang di <di.wang@whamcloud.com>
Change-Id: I54d97d5c84a5b38ebeae77522bd8666206ef2701
Reviewed-on: http://review.whamcloud.com/4787
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>