Trying to configure the plugin configuration as code 

Below was the groovy script , but it is not updating any thing.

import java.lang.System
import java.io.File
import hudson.model.*
import jenkins.model.*

import net.sf.json.JSONObject
import org.kohsuke.stapler.StaplerRequest
import quality.gates.jenkins.plugin.*

def instance = Jenkins.getInstance()

def sonarQualityGate = instance.getDescriptor(GlobalConfig.class)

JSONObject sonarQualityGateProperties = new JSONObject()

sonarQualityGateProperties.put("name", "sonarQube")
sonarQualityGateProperties.put("timeToWait", 10)
sonarQualityGateProperties.put("maxWaitTime", 10)
sonarQualityGateProperties.put("url", "http://localhost:9000")
sonarQualityGateProperties.put("token", "b035c32db2405002e72d4d6ee02b5a98e2d2548c")

sonarQualityGate.configure(null,sonarQualityGateProperties)

instance.save()