SOLR-5164: add relative solr.home testing to some tests, explicitly check for expected instanceDir handling with relative solr.home
SOLR-5099: explicity check for proper solrcore.properties creation
Speed up some tests by setting leaderVoteWait to 0

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1514858 13f79535-47bb-0310-9956-ffa450edef68