add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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# From http://www.rsyslog.com/downloads/download-v8-stable/
sha256    06e2884181333dccecceaca82827ae24ca7a258b4fbf7b1e07a80d4caae640ca    rsyslog-8.22.0.tar.gz