public void disconnect() {
        connected = false;
        IOUtils.closeQuietly(jmxConnector);
        mbeanServerConnection = null;
    }
disconnect the MBeanClient. If it is remote JMX server, disconnect the connection. If it is
local, disconnect the binding.
ngrinder-core/src/main/java/org/ngrinder/monitor/share/domain/MBeanClient.java