RFR: Update .jcheck/conf

[Erik Helin]

Hi all,

please review this pull request that updates `.jcheck/conf` to the more recent format introduced by project [Skara](https://openjdk.java.net/projects/skara). The following things will now be checked for each commit:

- that _no_ bad whitespace is present
- that author name and email are present
- that committer name and email are present
- that _no_ executable files are present

Testing:
- Manual testing on Linux x64 using `git-jcheck`

Thanks,
Erik

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Commits:
 - 8d7c1afb: Update .jcheck/conf

Changes: https://git.openjdk.java.net/portola/pull/1/files
 Webrev: https://webrevs.openjdk.java.net/portola/1/webrev.00
  Stats: 37 lines in 1 file changed: 35 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/portola/pull/1.diff
  Fetch: git fetch https://git.openjdk.java.net/portola pull/1/head:pull/1

PR: https://git.openjdk.java.net/portola/pull/1