Zookeeper toggle

Allow the user to turn on/off zookeeper storage
Merge pull request #70 from powerist/working

Zookeeper toggle
Fix DHCP, code style, PRIMARY_TABLE, and config options
Merge pull request #72 from changbl/working

Fix DHCP, code style, PRIMARY_TABLE, and config options
Fix ZooKeeper bug

InceptionArp and InceptionDhcp depend on Inception.zk to initialize
Merge pull request #73 from changbl/working

Fix ZooKeeper bug
Fix zookeeper bug

Skip switch data creation if alreday there
Merge pull request #74 from changbl/working

Fix zookeeper bug