Add support for creating a persistent TUN device (that survives across Bonnet restarts).
gfe-relnote: n/a (QBONE-only change)
PiperOrigin-RevId: 278518919
Change-Id: I38defaf866017445425bf8425b6f3ab98df9a0a4
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.