iotests.py: tiny refactor: move system imports up
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Reviewed-by: NEric Blake <eblake@redhat.com> Message-Id: <20180312152126.286890-7-vsementsov@virtuozzo.com> Signed-off-by: NEric Blake <eblake@redhat.com>
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