tests: add sys prop for enabling solrcloud debug logging

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538196 13f79535-47bb-0310-9956-ffa450edef68
tests: solrcloud debug sys outs to sys err

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538198 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5311 - added support for training using multiple content fields for knn and naive bayes

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538205 13f79535-47bb-0310-9956-ffa450edef68
LUCENE-5321: remove Facet42DocValuesFormat and FacetCodec

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538245 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5311 trying to stop test failures

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538254 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5415

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1538325 13f79535-47bb-0310-9956-ffa450edef68