RFR: 8318707: Remove the Java Management Extension (JMX) Management Applet (m-let) feature [v3]

[Kevin Walls]

> Remove the MLet feature and its tests.
> 
> Some tests use MLet classes but are not testing MLets.  These are updated, to use another test MBean or an MBean which is a URLClassLoader, e.g.
> test/jdk/javax/management/MBeanServer/PostExceptionTest.java
> test/jdk/javax/management/remote/mandatory/loading/TargetMBeanTest.java

Kevin Walls has updated the pull request incrementally with one additional commit since the last revision:

  Remove unnecessary MLET_ Properties

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/16363/files
  - new: https://git.openjdk.org/jdk/pull/16363/files/ec9f5390..29ec31f2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16363&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16363&range=01-02

  Stats: 35 lines in 2 files changed: 0 ins; 30 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/16363.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16363/head:pull/16363

PR: https://git.openjdk.org/jdk/pull/16363