Instances shown as running while restarting with libvirt, hyperv, virtualbox (at least)

When using the libvirt backend and doing `multipass restart` while monitoring `watch -n1 multipass list` in a separate shell, the state is listed as `Running` throughout the reboot.

Reproduce the issue with `multipass restart` while watching `multipass list`, beginning with the libvirt backend and then checking the hyperv and virtualbox paths named in the issue. Trace how restart state is reported during reboot; done means the instance is not shown as `Running` throughout the restart for the affected backends.

Written by the indexing model from the issue text.