RFR: 342: Pull request bot should warn on merge commits with non-target branch parent [v2]

[Robin Westberg]

> Hi all,
> 
> Please review this change that checks if a PR contains merges from outside the current project, and suggests using a
> merge-style PR.
> Best regards,
> Robin

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

  Updated foreign merge detection

-------------

Changes:
  - all: https://git.openjdk.java.net/skara/pull/679/files
  - new: https://git.openjdk.java.net/skara/pull/679/files/25da5701..48e5663f

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/679/webrev.01
 - incr: https://webrevs.openjdk.java.net/skara/679/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/679.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/679/head:pull/679

PR: https://git.openjdk.java.net/skara/pull/679