Added dodie function to have a bit more control over die calls.

BUILD_NOCLEAN to not run make mrproper or remove .config.

POWEROFF_ON_{SUCCESS,ERROR} to turn off the power after tests.

Skip backtrace calls that were done by the backtrace tests.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>

Originally named autotest.pl, but renamed to ktest.pl now because
the autotest name is used by other projects.
Signed-off-by: NSteven Rostedt <rostedt@goodmis.org>