pause: remove SIGKILL handler
pause: remove SIGKILL handler

signal SIGKILL (as well as SIGSTOP) cannot be caught or ignored. And we
should remove this.

Signed-off-by: WANG Chao <cd838e719292b6436ba43e28d67c22e273b90191@ucloud.cn>

wcwxyz/virtcontainers,wcwxyz/virtcontainers,wcwxyz/virtcontainers,containers/virtcontainers,containers/virtcontainers