SOLR-4952: get all manged schema tests using solrconfig.snippet.randomindexconfig.xml - mainly by removing several solrconfig-*-managed-schema.xml files and using sys props in solrconfig-managed-schema.xml

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1513611 13f79535-47bb-0310-9956-ffa450edef68