Fix the VLAN + bridge problem
use rt_ifa_* instead of old rtinit in mpe
Removed mpe softc list, use an shared storage
Implemented wire

This implementation supports ethernet (raw) and ethernet-tagged.
Updated ifconfig(8) man page to know about mpw
Added mpw(4) man page
Added mpw(4) support for ifconfig(8)
renato@'s L2VPN LDPd patch