Add version guard to QuicUtil methods which are IETF QUIC only.
This includes some minor method parameter changes along the way.
No behavior change. not protected.
PiperOrigin-RevId: 317388565
Change-Id: Ia73f1028212a318d4640afa2fbdd0239e095e1f2
QUICHE (QUIC, Http/2, Etc) is Google‘s implementation of QUIC and related protocols. It powers Chromium as well as Google’s QUIC servers and some other projects.
