ONOS-639 SDN-IP tutorial script for IPv6

IPv6 netowrk is advertised.
IPv6 address is used for BGP peering.
Still using IPv4 address for ONOS peering.
*.json files are updated correspondingly.

Change-Id: I8fdac12d2d25b840dcadfb261667a9f98eb9f6be
diff --git a/tools/tutorials/sdnip/configs-ipv6/zebra.conf b/tools/tutorials/sdnip/configs-ipv6/zebra.conf
new file mode 100644
index 0000000..6a4ae95
--- /dev/null
+++ b/tools/tutorials/sdnip/configs-ipv6/zebra.conf
@@ -0,0 +1,5 @@
+! Configuration for zebra (NB: it is the same for all routers)
+!
+hostname zebra 
+password sdnip
+log stdout