Add Always on VPN to Privacy Settings page

This CL adds information about always-on VPNs to the Enterprise
Privacy Settings page.

Test: make RunSettingsRoboTests
Bug: 32692748

Change-Id: I2b59e2ec4c55308b323aaa478cd9c847fe0b4b55

src/com/android/settings/vpn2/VpnUtils.java

@@ -82,4 +82,8 @@ public class VpnUtils {
         return IConnectivityManager.Stub.asInterface(
                 ServiceManager.getService(Context.CONNECTIVITY_SERVICE));
     }
+
+    public static boolean isAlwaysOnVpnSet(ConnectivityManagerWrapper cm, final int userId) {
+        return cm.getAlwaysOnVpnPackageForUser(userId) != null;
+    }
 }