SOLR-6508: SolrSchemalessExampleTests -> SolrSchemalessExampleTest (removed trailing 's' blocking execution under Ant); example-schemaless solr home is now copied to a temp dir before executing the tests. (merged trunk r1624616)

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1624617 13f79535-47bb-0310-9956-ffa450edef68