LUCENE-4975: replicator module: make Maven configuration functional; remove unnecessary comment

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1481923 13f79535-47bb-0310-9956-ffa450edef68
avoid NRTCachingDirectory in this test

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1481936 13f79535-47bb-0310-9956-ffa450edef68