public Connection getConnection() throws Exception {
      if (this.connection == null) {
        this.connection = ConnectionFactory.createConnection(this.configuration);
      }
      return this.connection;
    }
This creates a new ClusterID wrapper that will automatically build connections and
configurations to be able to talk to the specified cluster
@param base the base configuration that this class will add to
@param key  the cluster key in the form of zk_quorum:zk_port:zk_parent_node
hbase-it/src/test/java/org/apache/hadoop/hbase/test/IntegrationTestReplication.java