add lib function

Signed-off-by: Ahmed Amamou <ahmed@gandi.net>
Signed-off-by: kamel Haddadou <kamel@gandi.net>
add new brctl command

trill            <bridge> {on|off}       turn trill on/off
setvni           <bridge> <port> <vni>   set virtual network id
delvni           <bridge> <port>         delete virtual network id
showvs           <bridge>                show vitrual network id
showmacs_nick    <bridge>                show a list of mac addrs and correspondant nick (experimental)

Signed-off-by: Ahmed Amamou <ahmed@gandi.net>
Signed-off-by: kamel Haddadou <kamel@gandi.net>