net/http: update bundled http2
Updates http2 to x/net/http2 git rev
1087133bc4a for:
http2: reject DATA frame before HEADERS frame
https://golang.org/cl/56770
http2: respect peer's SETTINGS_MAX_HEADER_LIST_SIZE in ClientConn
https://golang.org/cl/29243
http2: reset client stream after processing response headers
https://golang.org/cl/70510
Also updated TestRequestLimit_h2 as the behavior changed slightly due
to https://golang.org/cl/29243.
Fixes #13959
Fixes #20521
Fixes #21466
Change-Id: Iac659694f3a48b8bd485546a4f96a932e3056026
Reviewed-on: https://go-review.googlesource.com/71611
Run-TryBot: Tom Bergan <tombergan@google.com>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>