RFR: 394: Merge bot conflict resolution interaction requires separate credentials

[Robin Westberg]

Hi all,

Please review this change that allows the pull request bot to recognize specially formatted command comments made by
"itself" (most likely another bot using the same credentials).

Best regards,
Robin

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Commit messages:
 - Allow self-commands, use it for merge bot

Changes: https://git.openjdk.java.net/skara/pull/618/files
 Webrev: https://webrevs.openjdk.java.net/skara/618/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-394
  Stats: 58 lines in 4 files changed: 51 ins; 3 del; 4 mod
  Patch: https://git.openjdk.java.net/skara/pull/618.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/618/head:pull/618

PR: https://git.openjdk.java.net/skara/pull/618