8234083: DatagramSocket should report SO_BROADCAST as a supported option Summary: DatagramSocket had a setBroadcast and getBroadcast setter/getter pair but curiously didn't report SO_BROADCAST as a supported option. Note: the source code changes were accidentally pushed with 8234103 so this changeset only has the test changes. The reviewers listed below had already reviewed the full (source+test) changes. Reviewed-by: alanb, vtewari, chegar

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