Fix type names and passphrase requirement

Author: eddymoulton

LibGit2Sharp/SshUserKeyCredentials.cs LibGit2Sharp/SshKeyCredentials.csLibGit2Sharp/SshUserKeyCredentials.cs renamed to LibGit2Sharp/SshKeyCredentials.cs

@@ -6,7 +6,7 @@ namespace LibGit2Sharp
     /// <summary>
     /// Class that holds SSH username with key credentials for remote repository access.
     /// </summary>
-    public sealed class SshUserKeyCredentials : Credentials
+    public sealed class SshKeyCredentials : Credentials
     {
         /// <summary>
         /// Callback to acquire a credential object.
@@ -20,11 +20,6 @@ protected internal override int GitCredentialHandler(out IntPtr cred)
                 throw new InvalidOperationException("SshUserKeyCredentials contains a null Username.");
             }
 
-            if (Passphrase == null)
-            {
-                throw new InvalidOperationException("SshUserKeyCredentials contains a null Passphrase.");
-            }
-
             if (PrivateKey == null)
             {
                 throw new InvalidOperationException("SshUserKeyCredentials contains a null PrivateKey.");

…Git2Sharp/SshUserKeyMemoryCredentials.cs LibGit2Sharp/SshKeyMemoryCredentials.csLibGit2Sharp/SshUserKeyMemoryCredentials.cs renamed to LibGit2Sharp/SshKeyMemoryCredentials.cs LibGit2Sharp/SshUserKeyMemoryCredentials.cs renamed to LibGit2Sharp/SshKeyMemoryCredentials.cs

@@ -6,7 +6,7 @@ namespace LibGit2Sharp
     /// <summary>
     /// Class that holds SSH username with in-memory key credentials for remote repository access.
     /// </summary>
-    public sealed class SshUserKeyMemoryCredentials : Credentials
+    public sealed class SshKeyMemoryCredentials : Credentials
     {
         /// <summary>
         /// Callback to acquire a credential object.
@@ -20,11 +20,6 @@ protected internal override int GitCredentialHandler(out IntPtr cred)
                 throw new InvalidOperationException("SshUserKeyMemoryCredentials contains a null Username.");
             }
 
-            if (Passphrase == null)
-            {
-                throw new InvalidOperationException("SshUserKeyMemoryCredentials contains a null Passphrase.");
-            }
-
             if (PrivateKey == null)
             {
                 throw new InvalidOperationException("SshUserKeyMemoryCredentials contains a null PrivateKey.");