Refactor connection_bucket_refill(_helper) to avoid roundoff

We were doing "divide bandwidth by 1000, then multiply by msec", but
that would lose accuracy: instead of getting your full bandwidth,
you'd lose up to 999 bytes per sec.  (Not a big deal, but every byte
helps.)

Instead, do the multiply first, then the division.  This can easily
overflow a 32-bit value, so make sure to do it as a 64-bit operation.

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