CL 111835 changed Transport stream ID numbering to start atstream 3 when AllowHTTP is set. This was based on amisunderstanding:When a connection upgrades an HTTP/1.1 request to HTTP/2,the initial HTTP/1.1 request occupies stream 1.However, Transport does not perform HTTP protocol upgrades.When using a Transport to send unencrypted HTTP/2 requests,the entire connection uses HTTP/2, the first request issent as HTTP/2, and there is no reason not to use stream 1for this request.Starting from stream 3 is mostly harmless,but ClientConn.idleStateLocked assumes that client streamsstart from 1. This causes it to misidentify new single-useconnections as having already sent a request (when AllowHTTPis set), and therefore not suitable for use.Revert to always starting stream IDs at 1.Fixesgolang/go#67671Change-Id: I97c89de4ae49623d916f9dbd200f8252d2fd4247Reviewed-on:https://go-review.googlesource.com/c/net/+/591275LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>Reviewed-by: Jonathan Amsterdam <jba@google.com>

The ReadMsgUDP and WriteMsgUDP methods of UDPConn are not implemented(yet?) on Plan 9. Skip tests which require them.Fixesgolang/go#68288Change-Id: Ic6c81b19322d589c10b16da61e9b89284294be05Reviewed-on:https://go-review.googlesource.com/c/net/+/596795Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>Reviewed-by: Than McIntosh <thanm@google.com>

Update golang.org/x dependencies to their latest tagged versions.Change-Id: Ibb0ab46488252d035430a654eed5dd4caab7509eReviewed-on:https://go-review.googlesource.com/c/net/+/596895LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>Auto-Submit: Gopher Robot <gobot@golang.org>Reviewed-by: Than McIntosh <thanm@google.com>Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>