LU-8667 osp: validate FID before initializing precreate seq

LU-8667 osp: validate FID before initializing precreate seq

A few fixes for FID on OST...

Check if the OSP FID is valid before initializing
precreate sequence, in case the last_seq/oid file
is corrupted. Only MDT0 can use IDIF, and non-MDT0
can only use normal FID, which will also make sure
the following orphan cleanup will use the valid
sequence.

OFD will validate the object sequence to make sure
IDIF request will only operate on MDT0 group.

If MDT can not get new sequence from OST, it will
sleep 2 seconds before retry, to offer OSTs some
extra time to setup FID service with sequence
controller (MDT0).

Signed-off-by: Di Wang <di.wang@intel.com>
Change-Id: Id9bbfaf9170ff1a9240719eaee73ddcb4fd804e5
Reviewed-on: http://review.whamcloud.com/22934
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>