OVSDriver: support VLAN encap in ind_ovs_emit_key
OVSDriver: support VLAN encap in ind_ovs_emit_key

The Netlink attributes are supposed to be recursive, not flat like the previous
code was emitting.

floodlight/ivs,vezril/ivs,vezril/ivs,floodlight/ivs,floodlight/ivs,vezril/ivs