Some settings only take effect when the serving planes start, so a
console change to them needs a restart the operator can trigger without
a shell. host.restart joins the power actions and ends sessions the same
way. On Linux it restarts the punktfunk-host user unit this process runs
in; on Windows the host exits with a code the service supervisor
relaunches at once, without counting it toward the crash backoff or the
update rollback.
The settings page names what waits for a restart and offers the action
behind the console password, and Home shows the same list as a check
until the new process is up.
Refs #867
enricobuehler
e389b73a25