testcase/kernel: Change signal for waking up a receiver thread in mqeue tc.
testcase/kernel: Change signal for waking up a receiver thread in mqeue tc.

Signo 9 is for terminating the task or pthread, not for waking up.
If pthread_kill(PID, 9) is sent, receiver will be terminated, so returns for pthread_cancel and pthread_join will be changed unexpected.

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