RFR: 8282536: java.net.InetAddress should be a sealed class

[Roger Riggs]

On Fri, 11 Mar 2022 16:47:46 GMT, Aleksei Efimov <aefimov at openjdk.org> wrote:

> The following fix seals the `java.net.InetAddress` class and permits only two implementations - `java.net.Inet4Address` and `java.net.Inet6Address`. 
> 
> No issues have been detected by regression and JCK tests.
> 
> Links: [JBS](https://bugs.openjdk.java.net/browse/JDK-8282536) [CSR](https://bugs.openjdk.java.net/browse/JDK-8282880)

Marked as reviewed by rriggs (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/7789