Quick Quality-of-Life Improvements

[fsflover]

@tabbyrobin

I use this one-liner almost every day for sys-usb and sys-net:
qube=sys-usb ; qvm-run --no-autostart "$qube" 'sudo poweroff' ; while qvm-check --running "$qube" ; do sleep 1 ; done ; qvm-start "$qube"

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