[release-branch.go1] net/http: non-keepalive connections close successfully

[release-branch.go1] net/http: non-keepalive connections close successfully

««« backport 820ffde8c396
net/http: non-keepalive connections close successfully

Connections did not close if Request.Close or Response.Close was true. This meant that if the user wanted the connection to close, or if the server requested it via "Connection: close", the connection would not be closed.

Fixes #1967.

R=golang-dev, rsc, bradfitz
CC=golang-dev
https://golang.org/cl/6201044

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