Certain commands were listed as bridge and interface but are really just interface commands. also start the tedious process of cleaning up interface()
give bridge and interface mode two different command lists so command completion works properly between the two. unfortunately this requres an additional global pointer, whichlist, that tells the completion code which list we are talking about. oh well, it's better than command completion giving false positives.
oh yeah, int_help needs to know which list (bridge, interface) we are helping for
Set and display interface priority (now that the priority command doesn't clash with bridge priority, all is well in the universe)