make vlan_file optional

[Jouni Malinen]

On Sun, Apr 07, 2013 at 11:02:03PM +0200, michael-dev wrote:
> currently hostapd depends on vlan_file even if all vlan interfaces
> get generated by full_dynamic_vlan.
> This makes it a little bit complicated to generate a hostapd
> configuration files on the ap on-the-fly as needed, as one will
> always need to generate bss-specific vlan_files too.
> The attached patch makes life easier by using the
> "<device>.<vlan-id>" scheme if no vlan_file entries are provided and
> dynamic vlans are enabled.

Thanks, applied.

-- 
Jouni Malinen                                            PGP id EFC895FA