LU-10395 osd: stop OI at device shutdown

LU-10395 osd: stop OI at device shutdown

and not at obd_cleanup(). otherwise a race is possible:
 umount <MDT> stopping OI vs MGS accessing same OSD which
results in the assertion:
ASSERTION( osd->od_oi_table != NULL && osd->od_oi_count >= 1 )

Signed-off-by: Alex Zhuravlev <bzzz@whamcloud.com>
Change-Id: I24fccea718f2e2663166cfb0ff26571039357535
Reviewed-on: https://review.whamcloud.com/37615
Reviewed-by: Alexander Boyko <c17825@cray.com>
Reviewed-by: Alexander Zarochentsev <alexander.zarochentsev@hpe.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>