RFR: 383: More fuzzy matching of bug ids in PR titles

[Robin Westberg]

Hi all,

Please review this change that allows a more relaxed matching of bug ids in PR titles. Also contains a bit of
refactoring to make it explicit when the project name could be part of the bug id. There were several places that
expected the project name to not be present (as they would fetch the issue using the key from a specific project) -
these now explicitly use the shortId.

Best regards,
Robin

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Commit messages:
 - Introduce relaxed issue parsing, and use it when parsing PR titles

Changes: https://git.openjdk.java.net/skara/pull/623/files
 Webrev: https://webrevs.openjdk.java.net/skara/623/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-383
  Stats: 156 lines in 15 files changed: 70 ins; 20 del; 66 mod
  Patch: https://git.openjdk.java.net/skara/pull/623.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/623/head:pull/623

PR: https://git.openjdk.java.net/skara/pull/623