RFR 8241073: Pre-generated Stubs for javax.management, Activation, Naming

[Roger Riggs]

Please review adding pre-generated RMI stub classes to the jdk repo
and the removal of make files supporting the specific APIs.

It removes a dependency on build time generation invoking RMIC.
RMIC was  deprecated in JDK 13 [1].

The source files have been edited to remove or suppress compilation 
warnings.

Webrev:
    http://cr.openjdk.java.net/~rriggs/webrev-stubs-classes-8241073/

Issue:
  https://bugs.openjdk.java.net/browse/JDK-8241073


Thanks, Roger

p.s. A future change will remove the interim build steps


[1] https://bugs.openjdk.java.net/browse/JDK-8217412