RFR: 335: The JBS notifier should use a different method to find PRs

[Robin Westberg]

Hi all,

Please review this change that ensures that the JBS notifier properly searches for a matching PR.

Best regards,
Robin

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Commit messages:
 - Search for matching PR when updating issues in prOnly mode

Changes: https://git.openjdk.java.net/skara/pull/567/files
 Webrev: https://webrevs.openjdk.java.net/skara/567/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-335
  Stats: 11 lines in 2 files changed: 1 ins; 0 del; 10 mod
  Patch: https://git.openjdk.java.net/skara/pull/567.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/567/head:pull/567

PR: https://git.openjdk.java.net/skara/pull/567