selftests: timers: Add leap-second timer edge testing to leap-a-day.c

Prarit reported an issue w/ timers around the leapsecond, where a
timer set for Midnight UTC (00:00:00) might fire a second early right
before the leapsecond (23:59:60 - though it appears as a repeated
23:59:59) is applied.

So I've updated the leap-a-day.c test to integrate a similar test,
where we set a timer and check if it triggers at the right time, and
if the ntp state transition is managed properly.

Reported-by: Daniel Bristot de Oliveira <[email protected]>
Reported-by: Prarit Bhargava <[email protected]>
Signed-off-by: John Stultz <[email protected]>
Cc: Richard Cochran <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Jiri Bohac <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Ingo Molnar <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>

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