tree 75ed6cbe0cffee22d7e8d03c9426508058747825
parent 6caee5f40b147a855cc90fae2d286d44426fcc3b
author pingping-lin <pingping@onlab.us> 1409176997 -0700
committer Saurav Das <sauravdas@alumni.stanford.edu> 1409942846 -0700

fix ARP (single onos instance & multiple onos instances)

1. make sure that ARP requests coming from host in a LAN
   are not broadcasted to all other edge ports (other ASes)
2. make sure the ARP requests from BGPd host can be singlecast
   to other ASes
3. add a 'get external network switch ports' function
4. make the arp work for both single onos instance & multiple
   onos instances
5. add a switch ports blacklist. Arp requests are not to be sent
   to those switch ports on this list.

Change-Id: I4ffdd73e2ad202517c54690a86109cfa1fbe400f