Update bound port on ForwardedPortDynamic after connection (in case original was passed as zero) (#1577)

* update bound port (in case original was passed as zero)

* Needed to allow private set for BoundPort

Author: timyhac

src/Renci.SshNet/ForwardedPortDynamic.cs

@@ -40,7 +40,7 @@ public class ForwardedPortDynamic : ForwardedPort
         /// <summary>
         /// Gets the bound port.
         /// </summary>
-        public uint BoundPort { get; }
+        public uint BoundPort { get; private set; }
 
         private Socket _listener;
         private CountdownEvent _pendingChannelCountdown;
@@ -168,6 +168,9 @@ private void InternalStart()
             _listener.Bind(ep);
             _listener.Listen(5);
 
+            // update bound port (in case original was passed as zero)
+            BoundPort = (uint)((IPEndPoint)_listener.LocalEndPoint).Port;
+
             Session.ErrorOccured += Session_ErrorOccured;
             Session.Disconnected += Session_Disconnected;