LU-15195 ofd: missing OST object

LU-15195 ofd: missing OST object

as the OST-MDT resync may be not finished by the end of the recovery
it may happen new enqueue for a write op may fail due to an absent
object. Return EINPROGRESS so that the enqueue was resent until get
resynced.

to not get stuck forever in case of disappeared MDT or a double
failure, return EINPROGRESS during hard failover timeout only.

also, cleanup replay-ost-single test 12:
- eliminate a need in the hard failover
- no need in a special obd_fail_loc, just use replay_barrier
- createmany is able to create files with unique names,
  no need in special steps

HPE-bug-id: LUS-10267
Signed-off-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Change-Id: I5f16b63454c51ad8d112770c15c7e6e7f41f3c40
Reviewed-by: Sergey Cheremencev <c17829@cray.com>
Reviewed-by: Alexander Boyko <alexander.boyko@hpe.com>
Reviewed-by: Andriy Skulysh <c17819@cray.com>
Tested-by: Alexander Lezhoev <c17454@cray.com>
Reviewed-on: https://review.whamcloud.com/45459
Reviewed-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-by: Sergey Cheremencev <sergey.cheremencev@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>