ktest: Cleanup terminal on dodie() failure

If dodie() is called with the console open, restore the terminal's
original settings before dying.

Link: http://lkml.kernel.org/r/20150130025453.GB20952@treble.redhat.com



Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>