units: fix all TTY paths for container gettys Spotted by Christian Seiler: http://lists.freedesktop.org/archives/systemd-devel/2015-January/027441.html

units: make sure container-getty@.service stops restarting when the pts device it is bound to is gone We only want to restart the getty as long as the pts device is still around. As soon as it is gone, the service should be removed to. http://lists.freedesktop.org/archives/systemd-devel/2014-December/026048.html

units: when spawning a getty configure TERM explicitly This way we can make use of our logic to automatically determine an appropriate TERM for a specific tty.

machinectl: add new command to spawn a getty inside a container