[quicwg/base-drafts] does version negotiation packet format need to be locked across versions (#569)

[Patrick McManus <[e-mail]>]

I can't find any language that makes the version negotiation packet consistent across versions.. 5.9 does some of it:

```
the location of the header form flag,
the location and size of the Connection ID field in both header forms,
the location and size of the Version field in long headers, and
the location and size of the Packet Number field in long headers.
```

but specifically the interpretation of the type byte and the format of the version numbers in the packet itself does not appear to be fixed. Given that the server is generating a version negotiation packet marked with a version that it does not understand (it came from the peer and triggered this path) I think this whole packet may need to be more constrained.


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