NAS-130278 (#14111)

Switch to tcp mode for bhyve VNC sessions with community provided
patch. Breaks some color pallet in the WebUI, but otherwise is
functional.

src/middlewared/middlewared/plugins/vm.py

@@ -919,7 +919,7 @@ def bhyve_args(self, *args, **kwargs):
             bool, [
                 '29',
                 'fbuf',
-                f'vncserver={attrs["vnc_bind"]}:{attrs["vnc_port"]}',
+                f'tcp={attrs["vnc_bind"]}:{attrs["vnc_port"]}',
                 f'w={width}',
                 f'h={height}',
                 f'password={attrs["vnc_password"]}' if attrs.get('vnc_password') else None,