Merge \"TetherUtil: Use ConnectivityManager for tethering\" into nyc-mr1-dev

package com.android.settingslib;

import android.content.Context;

import android.net.wifi.WifiManager;

import android.os.SystemProperties;

import android.telephony.CarrierConfigManager;

public class TetherUtil {

    public static boolean setWifiTethering(boolean enable, Context context) {

        final WifiManager wifiManager =

                (WifiManager) context.getSystemService(Context.WIFI_SERVICE);

        return wifiManager.setWifiApEnabled(null, enable);

    }

    private static boolean isEntitlementCheckRequired(Context context) {

        final CarrierConfigManager configManager = (CarrierConfigManager) context

             .getSystemService(Context.CARRIER_CONFIG_SERVICE);