bug: Same presignature ID reused 80+ times in an hour to generate signature

[ppca]

log link
Basically from 8:31 am Nov 6 - 9:31 am Nov 6 PST, log entries for dev node 0 where the presignature_id = 9223372036854776000, has 89 times joining protocol to generate a new signature, and has 46 times completed signature generation.

This should not happen because we should not be reusing the presignatures at all.

Note, I did observe this in our system while I was debugging our system in May. This likely is not a recent issue.

[volovyks]

And it is still there. This pre-signature is still being used to generate a signature.

[volovyks]

Something is wrong with our IDs. This ID has both a triple and a presignature, and they are constantly reused.

[volovyks]

@ppca please, check the PR, maybe it will shed some lite on this issue