topo-dpi: fix topo-dpi for Mininet

- removed d2 (mixed into d1) from topo-dpi
- added mn-pre for setting ipv6 address, and initializing the ovs
  by mn-init
- added some commands (mn-flows:dump-flows, mn-ping:ping6)
dpi-flows: fix flows for Bugs

- added the primary rule in standard, to avoid packets loss.