zdtm: check one-shot posix timers
zdtm: check one-shot posix timers

With the patch zdtm will check not only periodic timers, but also
one-shot ones.

 Set one-shot timer to expire in a very long interval (INT_MAX in the
 test), and check its remaining value after checkpoint/restore. The
 following relationship must hold:

 initial_value - remaining_value = time_passed

Signed-off-by: Vladimir Davydov <0d62248ee021b6e01c0ee596a62a5b145b996974@parallels.com>
Acked-by: Andrew Vagin <74c05afa918858348d6db8037d82fa8124870113@parallels.com>
Signed-off-by: Pavel Emelyanov <c9a32589e048e044184536f7ac71ef92fe82df3e@parallels.com>

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