RFR: JMC-8236: Actually hook in the jolokia discovery mechanism

[Martin Skarsaune]

This got left out of #570 . All the test runs fine, but the mechansim was not properly plugged in :facepalm: 
cc: @aptmac

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Commit messages:
 - JMC-8236: Actually hook in the discovery mechanism

Changes: https://git.openjdk.org/jmc/pull/583/files
  Webrev: https://webrevs.openjdk.org/?repo=jmc&pr=583&range=00
  Issue: https://bugs.openjdk.org/browse/JMC-8236
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jmc/pull/583.diff
  Fetch: git fetch https://git.openjdk.org/jmc.git pull/583/head:pull/583

PR: https://git.openjdk.org/jmc/pull/583