Add the UDP multicast stream dialog. Abuse TapParameterDialog a bit more
so that we can edit parameters.
Remove some unused struct members and an unused function.
Change-Id: I962c70344e792f0959527e4bcba8a20bd7e8acf9
Reviewed-on: https://code.wireshark.org/review/10084
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Reviewed-by: Gerald Combs <gerald@wireshark.org>