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

[Alan Bateman]

On Fri, 3 Mar 2023 10:36:45 GMT, JackyWoo <duke 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.

[PR 12872](https://github.com/openjdk/jdk/pull/12872) is already under review for this issue.

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