RFR: 378: Create merge conflict webrevs for "merge style" PRs without merge commit

[Robin Westberg]

Hi all,

Please review this change that creates a webrev containing only the merge conflicts for merge PRs that conflict with
their target.

Best regards,
Robin

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Commit messages:
 - Create conflict webrevs

Changes: https://git.openjdk.java.net/skara/pull/598/files
 Webrev: https://webrevs.openjdk.java.net/skara/598/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-378
  Stats: 131 lines in 4 files changed: 126 ins; 2 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/598.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/598/head:pull/598

PR: https://git.openjdk.java.net/skara/pull/598