RFR: CODETOOLS-7902959: jcstress: Update progress line to ANSI multi-line for better presentation

[Aleksey Shipilev]

When jcstress is presented with large font, the status line is too long to be useful. We can use multi-line ANSI codes to break it into pieces.

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Commit messages:
 - Whitespace fixes
 - CODETOOLS-7902959: jcstress: Update progress line to ANSI multi-line for better presentation

Changes: https://git.openjdk.java.net/jcstress/pull/65/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=65&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902959
  Stats: 99 lines in 6 files changed: 51 ins; 20 del; 28 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/65.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/65/head:pull/65

PR: https://git.openjdk.java.net/jcstress/pull/65