test/accept.c: add test for multishot mode accept
test/accept.c: add test for multishot mode accept

Add an test for multishot mode accept

Signed-off-by: Hao Xu <be9370943cbbcd3f8c1d8ba96cc214a522edd4f1@tencent.com>
Link: 74c7621a0d41681882c7abc8970e0915edf0adb5@gmail.com
Signed-off-by: Jens Axboe <cd8c6775e60d6f67a6984377324e5290df3d5358@kernel.dk>

axboe/liburing,axboe/liburing,axboe/liburing