QUIC support

[NotBad4U]

QUIC is an encrypted, multiplexed, and low-latency transport protocol designed from the ground up to
improve transport performance for HTTPS traffic and to enable rapid deployment and continued evolution of transport mechanisms.
cf The QUIC Transport Protocol: Design and Internet-Scale Deployment

This issue will keep all the documentation/research find on QUIC and list what are the impact of changes to support QUIC in sozu.

docs:

• quinn crate
  A futures-based QUIC implementation in Rust. The crate provide a client and server example. The architecture of the project has 2 sub crates: quinn and quinn-proto. We should take a look if we can include quinn-proto in sozu in order to avoid to reimplement the protocol by ourselves.
• ietf QUIC tracker
• RustFest Paris 2018 - A QUIC future in Rust by Dirkjan Ochtman
  (the author of quinn)

[gcxfd]

https://aws.amazon.com/cn/blogs/security/introducing-s2n-quic-open-source-protocol-rust/
s2n-quic