add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# locally computed
md5    f3eeaed018542963b7d2416ef1135ecc    libevent-2.1.8-stable.tar.gz
sha1    2a1b8bb7a262d3fd0ed6a080a20991a6eed675ec    libevent-2.1.8-stable.tar.gz