Remove some dead internal code

src/Renci.SshNet/Abstractions/SocketAbstraction.cs

@@ -88,40 +88,6 @@ private static void ConnectCore(Socket socket, EndPoint remoteEndpoint, TimeSpan
             args.Dispose();
         }
 
-        public static void ClearReadBuffer(Socket socket)
-        {
-            var timeout = TimeSpan.FromMilliseconds(500);
-            var buffer = new byte[256];
-            int bytesReceived;
-
-            do
-            {
-                bytesReceived = ReadPartial(socket, buffer, 0, buffer.Length, timeout);
-            }
-            while (bytesReceived > 0);
-        }
-
-        public static int ReadPartial(Socket socket, byte[] buffer, int offset, int size, TimeSpan timeout)
-        {
-            socket.ReceiveTimeout = timeout.AsTimeout();
-
-            try
-            {
-                return socket.Receive(buffer, offset, size, SocketFlags.None);
-            }
-            catch (SocketException ex)
-            {
-                if (ex.SocketErrorCode == SocketError.TimedOut)
-                {
-                    throw new SshOperationTimeoutException(string.Format(CultureInfo.InvariantCulture,
-                                                                         "Socket read operation has timed out after {0:F0} milliseconds.",
-                                                                         timeout.TotalMilliseconds));
-                }
-
-                throw;
-            }
-        }
-
         public static void ReadContinuous(Socket socket, byte[] buffer, int offset, int size, Action<byte[], int, int> processReceivedBytesAction)
         {
             // do not time-out receive

src/Renci.SshNet/Session.cs

@@ -467,11 +467,6 @@ public string ClientVersion
         /// </summary>
         internal event EventHandler<MessageEventArgs<NewKeysMessage>> NewKeysReceived;
 
-        /// <summary>
-        /// Occurs when <see cref="RequestMessage"/> message received
-        /// </summary>
-        internal event EventHandler<MessageEventArgs<RequestMessage>> UserAuthenticationRequestReceived;
-
         /// <summary>
         /// Occurs when <see cref="FailureMessage"/> message received
         /// </summary>
@@ -1675,15 +1670,6 @@ void ISession.OnDisconnecting()
             _isDisconnecting = true;
         }
 
-        /// <summary>
-        /// Called when <see cref="RequestMessage"/> message received.
-        /// </summary>
-        /// <param name="message"><see cref="RequestMessage"/> message.</param>
-        internal void OnUserAuthenticationRequestReceived(RequestMessage message)
-        {
-            UserAuthenticationRequestReceived?.Invoke(this, new MessageEventArgs<RequestMessage>(message));
-        }
-
         /// <summary>
         /// Called when <see cref="FailureMessage"/> message received.
         /// </summary>