RFR: 2509: Don't display duplicate jcheck warnings when the checks are displayed in Progress [v2]

[Zhao Song]

> In the pull request body, we have a 'Progress' part which will display the progresses of some jchecks, however, if the jchecks in the progress fails as warning, it will also be displayed in 'Warning' part. It will confuse the users.
> 
> The other issue is that, right now, if whitespace check is defined as warning in .jcheck/conf, then users are not able to know where are the whitespace issues.

Zhao Song has updated the pull request incrementally with two additional commits since the last revision:

 - update
 - update

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

Changes:
  - all: https://git.openjdk.org/skara/pull/1719/files
  - new: https://git.openjdk.org/skara/pull/1719/files/d1894fc2..e98a6acd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=skara&pr=1719&range=01
 - incr: https://webrevs.openjdk.org/?repo=skara&pr=1719&range=00-01

  Stats: 8 lines in 1 file changed: 8 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/skara/pull/1719.diff
  Fetch: git fetch https://git.openjdk.org/skara.git pull/1719/head:pull/1719

PR: https://git.openjdk.org/skara/pull/1719