Revert "[Mono.Debugger.Soft] Properly close connections"

This reverts commit 2da7707.

This was previously reverted because it was causing issues and it still does. It is a hack fix. We signal the connection for closing and next we send the dispose command over the network. This is obviously racy.

mcs/class/Mono.Debugger.Soft/Mono.Debugger.Soft/VirtualMachine.cs

@@ -150,8 +150,11 @@ public class VirtualMachine : Mirror
 		}
 
 		public void Detach () {
-			conn.Close ();
+			// Notify the application that we are detaching
 			conn.VM_Dispose ();
+			// Close the connection. No further messages can be sent
+			// over the connection after this point.
+			conn.Close ();
 			notify_vm_event (EventType.VMDisconnect, SuspendPolicy.None, 0, 0, null, 0);
 		}