RFR: Allow disabling bidirectional mailing list syncing per repo

[Robin Westberg]

Hi all,

Please review this small change that allows disabling bidirectional mailing list syncing per repository.

Best regards,
Robin

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Commit messages:
 - Allow disabling bidirectional mailing list syncing per repo

Changes: https://git.openjdk.java.net/skara/pull/558/files
 Webrev: https://webrevs.openjdk.java.net/skara/558/webrev.00
  Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/skara/pull/558.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/558/head:pull/558

PR: https://git.openjdk.java.net/skara/pull/558