Update sys to -current
Prepare MPLS code base to support wire

Initial preparations to avoid duplicated code between mpe and wire.
Implemented wire datapath pseudo device

Initial implementation of wire pseudo device to use with VPLS.
Added renato@'s L2VPN LDPd patch
Implemented ifconfig wire integration
Implemented wire packet capturing
Fixed ifconfig wire defaults and ethernet-tagged
Added wire reference to ifconfig man page