RFR: pr: remove commitCommandUsers

[Erik Helin]

Hi all,

please review this patch that removes the `commitCommandUsers` functionality from the PR bot. There is no need to describe the users who should be allowed to issue commit commands, all users should be able to do so. Individual commit commands might choose to limit users (e.g. based on census), but that should be up to individual commit commands.

Testing:
- [x] `make test` passes on Linux x64

Thanks,
Erik

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Commit messages:
 - pr: remove commitCommandUsers

Changes: https://git.openjdk.java.net/skara/pull/1016/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=1016&range=00
  Stats: 37 lines in 5 files changed: 0 ins; 28 del; 9 mod
  Patch: https://git.openjdk.java.net/skara/pull/1016.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/1016/head:pull/1016

PR: https://git.openjdk.java.net/skara/pull/1016