shutdown: Adding binary to shutdown the system

This functions are working as follows:
   - Send a SIGTERM to all processes that may be finished
   - Send a SIGKILL to all processes that still live and may be finished
   - Try to unmount all mount points
   - Try to remount read-only all mount points that can't be umounted
   - Umount all swap devices
   - Umount and detach all loopback devices
   - Call [poweroff|halt|reboot|kexec]

TODO:
   - Umount device-mapper.
   - Make log work. So far it is being useless as we do not parse
     /etc/systemd/system.conf, kernel command line but just
     environment, however we're executed by init and thus have no
     useful variables. Forcing it to target=kmsg/console and
     level=debug also does not produce any output, however writing to
     /dev/console does work (hack used during debug).

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