New fast-exit test-case

A fast-exit test-case that just writes one marker and exits,
tests that the consumer daemon maps the buffers before the
program exits. Exiting is tested both by normal return
and by commiting suicide (SIGKILL to self).

Signed-off-by: Nils Carlson <nils.carlson@ericsson.com>
Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>