[noise] Rekey support for test vectors

[Jake McGinty]

Hey Alex, thanks for making a mailing list post!

It still sounds reasonable to me, and it looks like nobody else has a strong opinion, so... *gavel slam*

~ jake

On Wed, Feb 6, 2019, at 4:57 AM, Alex wrote:
> Hi all,
> 
> Jake McGinty brought up the point[0] that the test vectors should have
> `REKEY()` support. I believe the best way to add it is to have a
> `rekey` boolean in the `message` object. If it's not present (or null)
> it shall default to False. Does this sound reasonable?
> 
> Alex
> 
> [0] https://github.com/centromere/cacophony/issues/12
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