RFR: 8274227: Remove "impl.prefix" jdk system property usage from InetAddress

Wed Sep 29 18:04:43 UTC 2021

On Wed, 29 Sep 2021 15:41:06 GMT, Aleksei Efimov <aefimov at openjdk.org> wrote:

> The following fix proposes to remove usages of `"impl.prefix"` JDK system property from the `java.net.InetAddress` class.
> This system property  is used to locate concrete implementations of the package private "java.net.InetAddressImpl" interface.
> 
> The list of changes:
>  -  `impl.prefix` usages are removed
>  -  `InetAddressImpl` made sealed interface by only allowing default implementations available in 'java.net' package: `Inet4AddressImpl` and `Inet6AddressImpl`.
> 
> tier1-tier3 tests show no failures  with this fix.

LGTM too. Good to see this old code go away!

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PR: https://git.openjdk.java.net/jdk/pull/5755