add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# Hash from: http://www.apache.org/dist/qpid/proton/0.9.1/qpid-proton-0.9.1.tar.gz.sha
sha1  98008d90acd0d47cbd7ac1572a2bb50b452338ed  qpid-proton-0.9.1.tar.gz