dabbad: make --tcp and --local use optional args.
dabbad: make --tcp and --local use optional args.

when no argument is given the proper default values are taken, yet the
requested connection method is used.

Signed-off-by: Emmanuel Roullit <e51ad7dcb99c77ecf30f537962c562ac80636eba@gmail.com>

eroullit/dabba,eroullit/dabba,eroullit/dabba,eroullit/dabba