RFR: 2667: Remove jmx-dev rules, merge into serviceability-dev [v2]

[Kevin Walls]

> The jmx-dev group is being dissolved, merged into serviceability.
> Please review this update to the mailing list rules.

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

  Also remove jmx-dev from GitMlRules.java

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Changes:
  - all: https://git.openjdk.org/skara/pull/1751/files
  - new: https://git.openjdk.org/skara/pull/1751/files/97115746..ed2db331

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1751&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1751&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1751.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1751/head:pull/1751

PR: https://git.openjdk.org/skara/pull/1751