RFR: Make the auto labeller less aggressive [v2]

[Robin Westberg]

> Only run automatic labeling of PRs once, to avoid interfering with manual decisions.

Robin Westberg has updated the pull request incrementally with one additional commit since the last revision:

  Fix failing tests

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Changes:
  - all: https://git.openjdk.java.net/skara/pull/992/files
  - new: https://git.openjdk.java.net/skara/pull/992/files/a03ea195..08056ab4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=skara&pr=992&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=skara&pr=992&range=00-01

  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/992.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/992/head:pull/992

PR: https://git.openjdk.java.net/skara/pull/992