Fix upload mode

Add autoconnect property to the ports
Remove the upload-node, clients that want to upload media just create a
node with an (unconnected) output port. Other clients can then connect
to this new output port.
Copy formats on newly linked ports.

pinos/gst/gstpinossrc.c

@@ -653,7 +653,11 @@ gst_pinos_src_negotiate (GstBaseSrc * basesrc)
     }
 
     GST_DEBUG_OBJECT (basesrc, "connect capture with path %s", pinossrc->path);
-    pinos_stream_connect (pinossrc->stream, PINOS_DIRECTION_INPUT, pinossrc->path, 0, accepted);
+    pinos_stream_connect (pinossrc->stream,
+                          PINOS_DIRECTION_INPUT,
+                          pinossrc->path,
+                          PINOS_STREAM_FLAG_AUTOCONNECT,
+                          accepted);
 
     while (TRUE) {
       PinosStreamState state = pinos_stream_get_state (pinossrc->stream);