Remove unused imports.

src/Renci.SshNet/Common/SshData.cs

@@ -4,7 +4,6 @@ using System.Collections.Generic;
 using System.Linq;
 #endif
 using System.Text;
-using System.Globalization;
 
 namespace Renci.SshNet.Common
 {

src/Renci.SshNet/IClientAuthentication.cs

@@ -1,9 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-
-namespace Renci.SshNet
+namespace Renci.SshNet
 {
     internal interface IClientAuthentication
     {

src/Renci.SshNet/ServiceFactory.cs

@@ -1,7 +1,6 @@
 using System;
 using System.Collections.Generic;
 using System.Linq;
-using System.Security.Cryptography;
 using System.Text;
 using Renci.SshNet.Common;
 using Renci.SshNet.Messages.Transport;

src/Renci.SshNet/Sftp/SftpFileAttributes.cs

@@ -1,9 +1,7 @@
 using System;
 using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using System.Globalization;
-using System.Text;
 using Renci.SshNet.Common;
 
 namespace Renci.SshNet.Sftp

src/Renci.SshNet/Sftp/SftpFileSystemInformation.cs

@@ -1,6 +1,4 @@
-using Renci.SshNet.Common;
-
-namespace Renci.SshNet.Sftp
+namespace Renci.SshNet.Sftp
 {
     /// <summary>
     /// Contains File system information exposed by statvfs@openssh.com request.