RFR: CODETOOLS-7902858: jcstress: Clean up progress message

[Aleksey Shipilev]

Current progress message seems overloaded. Printing the number of tests and forks is misleading after multiple forks and multiple VMs are run per test. We can simplify the implementation considerably.

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Commit messages:
 - CODETOOLS-7902858: jcstress: Clean up progress message

Changes: https://git.openjdk.java.net/jcstress/pull/17/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=17&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902858
  Stats: 58 lines in 2 files changed: 9 ins; 40 del; 9 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/17.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/17/head:pull/17

PR: https://git.openjdk.java.net/jcstress/pull/17