Fix grpclite memory leak issue, close reader's underlying io.Reader. #2658
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There's serveral issue related:
#702 #1170
When i use an outbound with grpc transport, after run Speedtest app or https://speedtest.net, memory grows very fast (usually >100MB on my Macbook). It's caused by http.response.Body is not closed when exec conn.Close(), the conn.Reader's type if bufio.Reader, common.Close will not close underlying rd.
This pr shows a way to solve the issue.