RFR: 423: Avoid combining messages with different subjects

[Robin Westberg]

Hi all,

Please review this small change that avoids combining mailinglist messages with different subjects, to enure that
integration notices are sent separately.

Best regards,
Robin

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Commit messages:
 - Avoid combining messages with different subjects

Changes: https://git.openjdk.java.net/skara/pull/668/files
 Webrev: https://webrevs.openjdk.java.net/skara/668/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-423
  Stats: 7 lines in 2 files changed: 7 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/skara/pull/668.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/668/head:pull/668

PR: https://git.openjdk.java.net/skara/pull/668