x/net/http2: frequent failures in TestTransportBodyReadError_.*

[bradfitz]

Saw flake on windows-386-2008 trybot run:
https://storage.googleapis.com/go-build-log/bead3586/windows-386-2008_71f1676b.log

--- FAIL: TestTransportBodyReadError_Some (0.00s)
    transport_test.go:742: server: body: []; expected [49 50 51]
FAIL
FAIL	golang.org/x/net/http2	23.120s

[bradfitz]

@euroelessar, you added this test in golang/net@1c5f79c for #27208.

Could you look into this and help deflake the test?

[bradfitz]

Also TestTransportBodyReadError_Immediately flakes:

https://storage.googleapis.com/go-build-log/b23ff2c8/windows-amd64-2016_3f47b07b.log

--- FAIL: TestTransportBodyReadError_Immediately (0.00s)
    transport_test.go:767: server: stream reset count: 0; expected: 1
FAIL
FAIL	golang.org/x/net/http2	13.610s

[gopherbot]

Change https://golang.org/cl/181198 mentions this issue: http2: disable a flaky test on Windows for now, add more logging

[millerresearch]

This test is flaky on Plan 9 too, because behaviour of connection close during a large write is not the same as with linux. Should also be disabled for Plan 9.