RFR[9] 8164625: Pooled HttpConnection should be removed during close

[Pavel Rappo]

Hello,

Could you please review the following change for [1]?

  http://cr.openjdk.java.net/~prappo/8164625/webrev.00/

This patch addresses the root cause of the problem. Namely, HTTP connections
used by requests made on behalf of the WebSocket (i.e. Opening Handshake) are no
longer returned to the connection pool. The provided test reproduces the
scenario described in the related issue.

Thanks,
-Pavel

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[1] https://bugs.openjdk.java.net/browse/JDK-8164625