LUCENE-4863: handle case where no overrides are built (fst is null)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1460859 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-4882: FacetsAccumulator did not allow to count dimensions directly

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1460977 13f79535-47bb-0310-9956-ffa450edef68
SOLR-4644: try passing test.distrib.skip.servers on - if we hit a replica, we want it passed to the leader

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1460980 13f79535-47bb-0310-9956-ffa450edef68