RFR: 7903750: TimeBudget (-tb) does not fulfill its promisses

[Jiří Vaněk]

Added warning, when time budget is to small, and final run will run at least two times longer.

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Commit messages:
 - added warning if timebudget is to small
 - print time budfget also for listing
 - intitial -tb warning

Changes: https://git.openjdk.org/jcstress/pull/161/files
  Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=161&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903750
  Stats: 84 lines in 3 files changed: 66 ins; 16 del; 2 mod
  Patch: https://git.openjdk.org/jcstress/pull/161.diff
  Fetch: git fetch https://git.openjdk.org/jcstress.git pull/161/head:pull/161

PR: https://git.openjdk.org/jcstress/pull/161