Extensions namespace fix.

src/Renci.SshNet.Tests/Classes/Channels/ChannelDirectTcpipTest_Close_SessionIsConnectedAndChannelIsOpen.cs

@@ -6,6 +6,7 @@ using System.Threading;
 using Microsoft.VisualStudio.TestTools.UnitTesting;
 using Moq;
 using Renci.SshNet.Channels;
+using Renci.SshNet.Common;
 using Renci.SshNet.Messages.Connection;
 using Renci.SshNet.Tests.Common;
 

src/Renci.SshNet.Tests/Common/AsyncSocketListener.cs

@@ -2,6 +2,7 @@
 using System.Net;
 using System.Net.Sockets;
 using System.Threading;
+using Renci.SshNet.Common;
 
 namespace Renci.SshNet.Tests.Common
 {