LU-15393 tests: check QoS hang with OST failover

LU-15393 tests: check QoS hang with OST failover

Patch adds recovery small test 152, to reproduce situation
where MDT object allocation sleeps on OST failover at
lod_ost_alloc_rr under lq_rw_sem read. And all other creation threads
hang at lod_ost_alloc_qos at down_write(lq_rw_sem).

HPE-bug-id: LUS-10388
Test-Parameters: trivial testlist=recovery-small env=ONLY=152
Signed-off-by: Alexander Boyko <alexander.boyko@hpe.com>
Change-Id: I7b9c5a5c9870a559e673a5fd253dcaea40d9fe63
Reviewed-on: https://review.whamcloud.com/47715
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andriy Skulysh <andriy.skulysh@hpe.com>
Reviewed-by: Vitaly Fertman <vitaly.fertman@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>