[quicwg/base-drafts] Server's preferred address (#1251)

[Mike Bishop <[e-mail]>]

Fixes #560; this is a specific post-handshake handoff by the server to a new IP address.  A more general ability to hand off to a different server address is left for the future, though it would probably take the form of a frame which is substantially similar to the new transport option.

One new requirement which isn't really specific to this but which this makes more obvious:  If you're trying to do connection migration, but you get a Stateless Reset on the new path, that doesn't mean the connection gets dropped -- it just means that IP from your new address took you to the wrong server, and your new address can't be used to continue the connection.

Based on `migration3`; **DO NOT MERGE** until #1249 has landed and the target of this PR has been changed.
You can view, comment on, or merge this pull request online at:

  https://github.com/quicwg/base-drafts/pull/1251

-- Commit Summary --

  * First pass at server preferred address

-- File Changes --

    M draft-ietf-quic-transport.md (132)

-- Patch Links --

https://github.com/quicwg/base-drafts/pull/1251.patch
https://github.com/quicwg/base-drafts/pull/1251.diff

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