RFR: 8267123: Remove RMI Activation

[Roger Riggs]

On Tue, 25 May 2021 18:04:45 GMT, Stuart Marks <smarks at openjdk.org> wrote:

> This is the implementation of [JEP 407](https://openjdk.java.net/jeps/407).
> 
> This is a fairly straightforward removal of this component.
>  - Activation implementation classes removed
>  - Activation tests removed
>  - adjustments to various comments to remove references to Activation
>  - adjustments to some code to remove special-case support for Activation from core RMI
>  - adjustments to several tests to remove testing and support for, and mentions of Activation
>  - remove `rmid` tool
> 
> (Personally, I found that reviewing using the webrev was easier than navigating github's diff viewer.)

LGTM

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Marked as reviewed by rriggs (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4194