Quick Quality-of-Life Improvements

[barto]

@tabbyrobin

qube=sys-usb ; qvm-run --no-autostart “$qube” ‘sudo poweroff’ ; while qvm-check --running “$qube” ; do sleep 1 ; done ; qvm-start “$qube”

Can be simplified to:
myqube="sys-usb"; qvm-shutdown --quiet --force --wait "$myqube" ; qvm-start "$myqube"