SOLR-5255: Remove unnecessary call to fetch and watch live nodes in ZkStateReader cluster watcher

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1529433 13f79535-47bb-0310-9956-ffa450edef68
SOLR-5300: Shards can be split by specifying arbitrary number of hash ranges within the shard's hash range

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/trunk@1529444 13f79535-47bb-0310-9956-ffa450edef68