RFR: 7903439: JMH: Print help to stdout instead of stderr [v2]

[Seeta Ramayya]

> I do not know the reason for using `System.err` for `help or -h`. I was expecting it to be in standard out not in error. 
> 
> Either of the things needs to be happen: 
> 
> - If it has to be `System.error` (for some reason) then it should be mentioned in `ReadMe.md` so that people like me does not get confused.
> - If it is `System.out` then PR needs to be merged :)  
> 
> Change is just `3` characters so I did not report any issue before creating PR.

Seeta Ramayya has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains one new commit since the last revision:

  Help text is not error message

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Changes:
  - all: https://git.openjdk.org/jmh/pull/95/files
  - new: https://git.openjdk.org/jmh/pull/95/files/253b7704..54d1c0ce

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmh&pr=95&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmh&pr=95&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jmh/pull/95.diff
  Fetch: git fetch https://git.openjdk.org/jmh pull/95/head:pull/95

PR: https://git.openjdk.org/jmh/pull/95