Add IPv6 to list_routes and delete_route

This lets list_routes() and delete_route() work for both IPv4 and
IPv6, allowing MultiPortVlanTransparencyTest in whitebox to
manupulate IPv6 routes without raw shell commands.

Change-Id: I76122f0ff07d9b4a0540cd70bab2959ed7335918
Signed-off-by: Renjing Xiao <rxiao@redhat.com>
1 file changed