SOLR-4816: CloudSolrServer can now route updates locally and no longer relies on inter-node update forwarding.
SOLR-3249: Allow CloudSolrServer and SolrCmdDistributor to use JavaBin.
SOLR-4816: CloudSolrServer now uses multiple threads to send updates by default.

git-svn-id: https://svn.apache.org/repos/asf/lucene/dev/branches/branch_4x@1521726 13f79535-47bb-0310-9956-ffa450edef68