fix exc messages

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1510617 13f79535-47bb-0310-9956-ffa450edef68
SOLR-2570: randomize more indexConfig settings in tests

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1510637 13f79535-47bb-0310-9956-ffa450edef68