Catch SocketException in SocketFrameHandler#Timeout

While out of scope of this bug, I need this to make the tests pass
on one of my machines. Plus we renamed SocketFrameHandler on this
branch, so changing this in default will require extra effort
later.

Author: michaelklishin

projects/client/RabbitMQ.Client/src/client/impl/SocketFrameHandler.cs

@@ -144,10 +144,19 @@ public int Timeout
         {
             set
             {
-                if (m_socket.Connected)
+                try
+                {
+                    if (m_socket.Connected)
+                    {
+                        m_socket.ReceiveTimeout = value;
+                    }
+                }
+                #pragma warning disable 0168
+                catch (SocketException _)
                 {
-                    m_socket.ReceiveTimeout = value;
+                    // means that the socket is already closed
                 }
+                #pragma warning restore 0168
             }
         }