LU-8535 lod: RR policy should not allocate on same ost

LU-8535 lod: RR policy should not allocate on same ost

Problem: With Round Robin (RR) policy we should not allowed
to create objects on same ost but currently it is possible.

Solution: lod_check_and_reserve_ost() skips a check for
already used OST when speed=0 i.e. at the first round of
object allocation. Enabling the check unconditionally to
fix above mention problem.

This patch contains both re-producer and the fix.

Signed-off-by: Rahul Deshmukh <rahul.deshmukh@seagate.com>
Signed-off-by: Alexander Zarochentsev <alexander.zarochentsev@seagate.com>
Seagate-bug-id: MRP-3480
Change-Id: I80895f8d7cc0a146a098869842bbc256152e6c2e
Reviewed-on: http://review.whamcloud.com/22090
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>