RFR: 553: Add informational message when automatic labeling comes up empty

[Robin Westberg]

Hi all,

Please review this change that makes the automatic labeler emit a helpful message when it either succeeds or fails with
its task.

Best regards,
Robin

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Commit messages:
 - Add auto-labeller help message when appropriate

Changes: https://git.openjdk.java.net/skara/pull/783/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=783&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-553
  Stats: 68 lines in 3 files changed: 66 ins; 0 del; 2 mod
  Patch: https://git.openjdk.java.net/skara/pull/783.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/783/head:pull/783

PR: https://git.openjdk.java.net/skara/pull/783