net/http: clear reference to the request context after transport getConn
Clears wannConn ctx and prevents pending dialConnFor after connection delivered or canceled.
Updates #50798
Change-Id: I9a681ac0f222be56571fa768700220f6b5ee0888
GitHub-Last-Rev:
fd6c83ab072c62d224ed8220c4c286b6e90bc151
GitHub-Pull-Request: golang/go#61524
Reviewed-on: https://go-review.googlesource.com/c/go/+/512196
Auto-Submit: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Reviewed-by: Damien Neil <dneil@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>