RFR: Proper detection of legacy integration comment

[Robin Westberg]

Hi all,

Please review this small change that updates the legacy integration pattern to match all forms of previously posted
comments.

Best regards,
Robin

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Commit messages:
 - Take optional markdown escapes into account

Changes: https://git.openjdk.java.net/skara/pull/609/files
 Webrev: https://webrevs.openjdk.java.net/skara/609/webrev.00
  Stats: 3 lines in 2 files changed: 0 ins; 0 del; 3 mod
  Patch: https://git.openjdk.java.net/skara/pull/609.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/609/head:pull/609

PR: https://git.openjdk.java.net/skara/pull/609