RFR: 127: Avoid sending consecutive emails too fast

[Robin Westberg]

Hi all,

Please review the following change that makes it possible to configure an interval between emails send to a mailing list.

Best regards,
Robin

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Commits:
 - 34e7229f: Add a sendInterval parameter to the mailmanserver

Changes: https://git.openjdk.java.net/skara/pull/204/files
 Webrev: https://webrevs.openjdk.java.net/skara/204/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-127
  Stats: 99 lines in 10 files changed: 58 ins; 0 del; 41 mod
  Patch: https://git.openjdk.java.net/skara/pull/204.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/204/head:pull/204

PR: https://git.openjdk.java.net/skara/pull/204