Fix remaining pkill tests.

I don't know that anyone cares, but these failures made me think I'd
broken something while testing the -SIGNAL patch.

The -s parsing wasn't taking into account that -s 0 is a special case,
and the -o test was assuming that pkill can tell the difference between
two processes started at roughly the same time. Hopefully there's
higher-resolution data available that can avoid the need for yet another
sleep in the tests.

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