RFR: 8327793: Deprecate jstatd for removal

[Kevin Walls]

jstatd is an RMI server application which monitors HotSpot VMs, and provides an interface to the monitoring tool jstat, for use across a remote RMI connection.

RMI is not how modern applications communicate. It is an old transport with long term security concerns, and configuration difficulties with firewalls.

The jstatd tool should be removed. Deprecating and removing jstatd will not affect usage of jstat for monitoring local VMs using the Attach API.

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Commit messages:
 - Remove tmp file
 - Annotations
 - Annotations
 - Merge remote-tracking branch 'upstream/master' into 8327793_jstatd_deprecate
 - Basic deprecation of module, jstatd prints warning.

Changes: https://git.openjdk.org/jdk/pull/19658/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19658&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8327793
  Stats: 35 lines in 12 files changed: 23 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/jdk/pull/19658.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19658/head:pull/19658

PR: https://git.openjdk.org/jdk/pull/19658