ktest: Allow success logs to be stored

Add a STORE_SUCCESSES option, to allow success logs to be stored, for
example to double-check or otherwise post-process the test logs.

Link: http://lkml.kernel.org/r/1321616131-21352-3-git-send-email-rabin@rab.in



Signed-off-by: Rabin Vincent <rabin@rab.in>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>