selftests/mm: optionally pass duration to transhuge-stress

Until now, transhuge-stress runs until its explicitly killed, so when
invoked by run_kselftest.sh, it would run until the test timeout, then it
would be killed and the test would be marked as failed.

Add a new, optional command line parameter that allows the user to specify
the duration in seconds that the program should run.  The program exits
after this duration with a success (0) exit code.  If the argument is
omitted the old behacvior remains.

On it's own, this doesn't quite solve our problem because run_kselftest.sh
does not allow passing parameters to the program under test.  But we will
shortly move this to run_vmtests.sh, which does allow parameter passing.

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Ryan Roberts <[email protected]>
Acked-by: David Hildenbrand <[email protected]>
Cc: Florent Revest <[email protected]>
Cc: Jérôme Glisse <[email protected]>
Cc: John Hubbard <[email protected]>
Cc: Mark Brown <[email protected]>
Cc: Peter Xu <[email protected]>
Cc: Shuah Khan <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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