Add OpenFlow 1.3 support to valve

 * Removes OpenFlow 1.0 support
Fix VLAN VID matches.
Fix grabbing in_port from a Packet In message.
Rework valve flows.

 * Clear all pre-existing flows on startup
 * Add catchall drop rule
Rework packet_in handler.

 * Use ryu Ethernet/VLAN parser
 * Clear up log messages
 * Fix variable name conflicts