Renamed translation_handler to vnet_edge_handler.
Separated vnet_edge_handler from packet_manager.
The datapath on the edge server holds the catch flow of vnet edge
Merge branch 'master' into refactor-translation-handler

Conflicts:
	vnet/lib/vnet/openflow/controller.rb
Added a default flow in EDGE_SRC table
Merge pull request #137 from axsh/refactor-translation-handler

Refactor translation handler