Seamless HA

1. New leader election
2. Seamless controller failover
Merge pull request #103 from powerist/leaderele

Seamless High Availability (HA with queue)
Merge load_failover_logs and handle_failover_log
Merge pull request #106 from powerist/leaderele

Merge load_failover_logs and handle_failover_log
Add timestamp to inception_arp eval and minor to logging
Merge pull request #108 from changbl/working

Add timestamp to inception_arp eval and minor to logging