MINOR: config: use the new bind_parse_args_list() to parse a "bind" line

MINOR: config: use the new bind_parse_args_list() to parse a "bind" line

This now makes sure that both the peers' "bind" line and the regular one
will use the exact same parser with the exact same behavior. Note that
the parser applies after the address and that it could be factored
further, since the peers one still does quite a bit of duplicated work.