initscripts: Restore locked root account access by using sulogin --force

[Dmitry Bogatov]

[2016-05-07 11:12] Andreas Henriksson <andreas at fatal.se>
> [...]
> The initscripts package (src:sysvinit) needs equivalent changes to
> restore the old status quo (and thus ignoring potential kiosk mode usecase
> problems -- kiosk mode users should alter their init scripts and remove
> the --force flag to be secure).

Sounds convincing to me. So I prepared commit wip/bug-823660.  Dear
co-maintainers, any objections?