RFR: 7903366: JOL: Clean up VM configuration messages

[Aleksey Shipilev]

We can be a little more clean with VM configuration messages.

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

Commit messages:
 - Work
 - Fix

Changes: https://git.openjdk.org/jol/pull/37/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=37&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903366
  Stats: 31 lines in 1 file changed: 16 ins; 8 del; 7 mod
  Patch: https://git.openjdk.org/jol/pull/37.diff
  Fetch: git fetch https://git.openjdk.org/jol pull/37/head:pull/37

PR: https://git.openjdk.org/jol/pull/37