RFR: 7455: Add support for jolokia JMX service connection [v21]

[Martin Skarsaune]

> Replaces parts of https://github.com/openjdk/jmc/pull/332

Martin Skarsaune has updated the pull request incrementally with two additional commits since the last revision:

 - JMC-7455: Use more meaningful message key
 - JMC-7455: Use explicit imports. Exclude attribute

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Changes:
  - all: https://git.openjdk.org/jmc/pull/548/files
  - new: https://git.openjdk.org/jmc/pull/548/files/816b353f..333fb182

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmc&pr=548&range=20
 - incr: https://webrevs.openjdk.org/?repo=jmc&pr=548&range=19-20

  Stats: 19 lines in 3 files changed: 13 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jmc/pull/548.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/548/head:pull/548

PR: https://git.openjdk.org/jmc/pull/548