Fix a problem with how TDB timeouts were used in pfkeyv2.

When we allocated a tdb we did a timeout_add before a timeout_set.
This was a problem in itself, but it shouldn't hurt too much.
What did hurt was that we did a timeout_set after the timeout_add,
timeout_set marked the timeout as not being on the timeout list and if we
did a timeout_del (or timeout_add) later (before the timeout fired) we
ended up with a chunk of freed memory on the timeout queue or maybe
even dangling pointers (or a circular list).

This should probably cure the timeout queue corruption some people were
seeing lately.

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