make vlan_file optional

[michael-dev]

Hi,

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.

Regards,
  M. Braun
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