This CL adds skipped failing tests, showing differences between HTTP/1
and HTTP/2 behavior. They'll be fixed in later commits.

Only a tiny fraction of the net/http tests have been split into their
"_h1" and "_h2" variants. That will also continue. (help welcome)

Updates #6891
Updates #13315
Updates #13316
Updates #13317

Change-Id: I16c3c381dbe267a3098fb266ab0d804c36473a64
Reviewed-on: https://go-review.googlesource.com/17046
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Andrew Gerrand <adg@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>

This compares the behavior of server handlers and the net/http
Transport in both HTTP/1 and HTTP/2 mode and verifies they're the
same.

This also moves some client<->server tests into clientserver_test.go.
Many of them were in serve_test.go or transport_test.go but were
basically testing both.

h2_bundle.go is an update of the golang.org/x/net/http2 code
from https://golang.org/cl/17204 (x/net git rev c745c36eab10)

Fixes #13315
Fixes #13316
Fixes #13317
Fixes other stuff found in the process too
Updates #6891 (http2 support in general)

Change-Id: Id9c45fad44cdf70ac95d2b89e578d66e882d3cc2
Reviewed-on: https://go-review.googlesource.com/17205
Reviewed-by: Andrew Gerrand <adg@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>

Fixes found in the process of adding more A/B tests to net/http,
comparing HTTP/1 and HTTP/2 behaviors.

Most of the new tests are in Gerrit change Id9c45fad44cdf70ac9
in the "go" repo.

Fixes golang/go#13315
Fixes golang/go#13316
Fixes golang/go#13317
Fixes other stuff found in the process too
Updates golang/go#6891 (http2 support in general)

Change-Id: I83b5bfb471047312c0dcb0a0b21d709008f34136
Reviewed-on: https://go-review.googlesource.com/17204
Reviewed-by: Andrew Gerrand <adg@golang.org>