Fix exception type in token refresh e2e test

Author: timtay-microsoft

e2e/test/DeviceTokenRefreshE2ETests.cs

@@ -2,7 +2,7 @@
 // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 using Microsoft.Azure.Devices.Client;
-using Microsoft.Azure.Devices.Common.Exceptions;
+using Microsoft.Azure.Devices.Client.Exceptions;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using System;
 using System.Diagnostics;