crypto/tls: timeout tests

[randall77]

Please answer these questions before submitting your issue. Thanks!

1. What version of Go are you using (go version)?

tip

1. What operating system and processor architecture are you using (go env)?

linux/amd64

1. What did you do?

run the crypto/tls tests. Occasionally, I get the error:

--- FAIL: TestDialTimeout (0.01s)
tls_test.go:192: resulting error not a timeout: dial tcp 127.0.0.1:49575: i/o timeout

The test used to detect whether an error is a timeout is to look for the string "timed out" in the error string. Maybe we should include "timeout" also?

[bradfitz]

I can't reproduce but I sent https://go-review.googlesource.com/20403 which at least also still passes for me and will fail with more info if it continues to flake for you.