RFR [11] 8198358 : Align organization of DualStackPlainSocketImpl with TwoStacksPlainSocketImp [win]

[Chris Hegarty]

> On 27 Mar 2018, at 18:30, Ivan Gerasimov <ivan.gerasimov at oracle.com> wrote:
> 
> Thank you Christoph and Chris for the review!
> 
> I made the following suggested changes:
> - fdAccess made private static final in both TwoStacks and DualStack.
> - removed redundant check IS_NULL(iaObj) at bind0 (indeed, the address was already checked at Java level).
> 
> For now, I would prefer to keep the checks for family == IPv4 as they are.
> I totally agree they should be moved to Java, but I'm planning to do this during the TwoStacks-DualStack merge step.
> 
> I'm also planning to add a regtest to make sure that Inet6Address is rejected when fed to a IPv4-only socked.
> 
> Are we good to push now?

Yes.

-Chris.