RFR: 623: Label rules filter should take direct group matches into account

[Robin Westberg]

When a mailing list rule filter matches a group, any group members should be removed from the list of matches.

Best regards,
Robin

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Commit messages:
 - Remove group matches separately

Changes: https://git.openjdk.java.net/skara/pull/839/files
 Webrev: https://webrevs.openjdk.java.net/?repo=skara&pr=839&range=00
  Issue: https://bugs.openjdk.java.net/browse/SKARA-623
  Stats: 27 lines in 2 files changed: 25 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/839.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/839/head:pull/839

PR: https://git.openjdk.java.net/skara/pull/839