Added C.stat_mtime(filename) to check file modification time.
neutron2snabb: Script to convert Neutron database to snabb config.
neutron-sync-master: Added DB-sync script for Network Node.
neutron-sync-agent: Added DB sync script for Compute Nodes.
Added snabbnfv-traffic traffic handling process script.
Made Neutron scripts executable.
Add config.graphviz(c) to create a graphviz diagram.

This is handy for sanity-checking app networks by eye.
packet_filter: Accept 'rx' and 'tx' as port names too.
Merge pull request #180 from lukego/neutron

Add OpenStack Neutron agents