HBASE-7757 Add web UI to REST server and Thrift server

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1443064 13f79535-47bb-0310-9956-ffa450edef68
HBASE-7772 Cluster ID is not initialized correctly in RPC client

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1443181 13f79535-47bb-0310-9956-ffa450edef68