Summary
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Remove the RMI Activation API and implementation, and the `rmid` tool.
Problem
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RMI Activation is obsolete and will be removed. See [JEP 407](https://openjdk.java.net/jeps/407) for full background.
Solution
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Removal of RMI Activation entails the following changes to Java SE specifications, or JDK specifications where noted:
* removal of the `java.rmi.activation` package from the `java.rmi` module
* removal of references to the `java.rmi.activation` APIs from other parts of Java SE (mostly from other parts of `java.rmi`)
* removal of mentions of Activation from the RMI Specification
* removal of the `rmid` command-line tool and specification (these are JDK-specific)
Specification
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Specdiff attached: [specdiff.rmiactivation.zip](https://bugs.openjdk.java.net/secure/attachment/94625/specdiff.rmiactivation.zip)
Textual diffs to the RMI Specification are attached: [rmispec-v2.diffs](https://bugs.openjdk.java.net/secure/attachment/94629/rmispec-v2.diffs). Mostly this is removal of the text of the RMI Activation chapter, plus other editorial adjustments.