RFR: 8303509: Socket setTrafficClass does not work for IPv4 connections when IPv6 enabled

[JackyWoo]

On Fri, 3 Mar 2023 11:56:20 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>> This pr try to fix [JDK-8303509](https://bugs.openjdk.org/browse/JDK-8303509): Socket setTrafficClass does not work for IPv4 connections when IPv6 enabled.
>> 
>> ### Change Log
>> When setting traffic class with IPv6 enabled, also set to IPv4 family.
>
> You will need to change the title of your PR, which you might as well do while waiting for your OCA to be confirmed. First, add a space after the "8303509:". Second, change the rest of it to _exactly_ match the title of the bug, meaning do not use the word "fix" in the title, nor use back-ticks for code style. Putting that all together, the title should be exactly the following:
> 
> 8303509: Socket setTrafficClass does not work for IPv4 connections when IPv6 enabled

@kevinrushforth Thanks for you help to my first open JDK PR.

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PR: https://git.openjdk.org/jdk/pull/12852