remove dead code: calling ether_attach which sets if_type to IFT_ETHER,

remove dead code: calling ether_attach which sets if_type to IFT_ETHER,
just to set it to IFT_L2VLAN right afterwards, just to set if_type
to the parent's if_type which can be anything as long as it is IFT_ETHER
at config time doesn't make any sense and has zero effect. stop fiddling
with if_type alltogether.
also remove a question in a comment that has been answered by the last 14
years.
from Marrakesh airport, ok reyk