Added virtual port

Currently incomplete in that virtual port is not generic.  The
vport create command explicitly specifies q-in-q.  This is to
avoid some issues with loxi currently.
Added bw ext types
Remove extra comment markers
Add enum of q-in-q

Update translation to transparently return the original identifier
if no translation occurred.
Updates to some reply/request pairs

Starting to follow the convention that all set operations come in
request/reply pairs with a status code in the reply.
Merge remote-tracking branch 'origin/master' into bsn_det_vport

Conflicts:
	loxi_front_end/type_maps.py
	openflow_input/bsn_l2_table
Merge branch 'bsn_det_vport'