When we attach an interface, do not try to reuse the last index to

limit the possible races related to unscheduled task, or anything
else, relying on an unique index.

I say "limit" here because a race can still occurs if you run out
of indexes and jump back to 1.  A generation number can be added
later to avoid this problem.

ok deraadt@, claudio@, krw@, mikeb@, "I can live with it" reyk@

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