Merge pull request #21 from changbl/working

Fix minor inception_dhcp code style
Fix bash bug

Shall not set controller to be in-band
after deleting controller, as this would
cause "ovs-vsctl: no row "obr1" in table Controller"
Merge pull request #22 from powerist/bash

Fix bash bug
Broadcast in inception finished

On switch connection, controller identify all ports of the switch.
Then a flow will be set on the switch.
On source learning, controller will set up another flow on the switch
to override the first flow when the source of the broadcast message
is from hosts connected by the switch
Merge pull request #23 from powerist/working

Broadcast in inception finished
Fix BROADCAST bug