tests: reduce multicqe_drain waiting time
tests: reduce multicqe_drain waiting time

sleep(4) is too long and not needed, wait just for one second, should be
good enough.

Signed-off-by: Pavel Begunkov <8608d41fe50396a9dbd36e830be65ba791e26c05@gmail.com>
Link: https://lore.kernel.org/r/5f2ddf9fb44d4b746c12654dad649db1470c2748.1650186365.git.8608d41fe50396a9dbd36e830be65ba791e26c05@gmail.com
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing