add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Locally calculated after checking pgp signature
sha256    f2ce1e989b272cfcb677616763e0a2e7ec659effa67a88aa92b3a65528f60a3c    pycrypto-2.6.1.tar.gz