Refactored the lookup methodology of the edge port db entry.
Query port_manager to see the type of a given port.
Fixed edge_to_virtual packet handling.
Temporary not handle ICMP packet instead wait until ARP cache expired.
Use openflow instead of ovs flow
Deleted unnecessary description
Use MAC_BROADCAST constant.
Used openflow and removed embedded magic numbers.
Merge branch 'master' into refactor-edge-packet-handling
Merge pull request #139 from axsh/refactor-edge-packet-handling

Refactor edge packet handling