Run sudo-required action via actions.superuser_run
Actions related to services those require `sudo` permissions need to
be executed via actions.superuser_run.
NOTE:
If plinth service is started via `sudo ./run --debug` (in dev mode)
all actions will be executed silently. But plinth in user machines
won't be executed with sudo permissions.
- API: start, stop, enable, disable, reload, is-running, is-enabled, list
- only allows access to a service if the service name is listed in a
'managed_services' variable of any plinth module.
