Merge pull request #7 from powerist/working

Style cleaning-up
More cleanup
Merge pull request #8 from changbl/working

More cleanup
Redo ARP code
Merge pull request #10 from changbl/working

Redo ARP code
Fix a bit of get_ip_by_port() in inception_arp

Still not perfect solution. But the way of using ssh command is too
slow.
Merge pull request #11 from changbl/working

Fix a bit of get_ip_by_port() in inception_arp
Full-fledged ARP

Add fault-tolerance and time-out handling for ARP protocol