fff-network: Make CLIENT default status for one-/two-port devices

The V2 firmware requires initialization of the WiFi interfaces
by a hood file. If a one-port (or two-port) device is isolated,
it won't get this information from other WiFi nodes (w2sta mode).

In addition, it cannot be connected to the internet, as this would
require the port to be in WAN mode. It is also not possible to
connect a client device for configuration, since WiFi is not
configured and the LAN port is in BATMAN mode.

To enable configuration of an isolated one-port/two-port device,
this patch thus changes the default port config to CLIENT, so
the user can choose the desired configuration more easily.

For two-port, we will have one port WAN and the second port
CLIENT.

Fixes #110

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
Reviewed-by: Harald Thuemmler <int@bnhof.de>
Reviewed-by: Fabian Bläse <fabian@blaese.de>