Add indexes
Update for datapath network events
Update for datapath events
Don't create interface objects that is not related to the node
Update DcSegmentManger and TunnelManager for datapath and datapath network events
Refactor event.rb
Add datapath_spec.rb
Add a simple console script
Refactor managers
Enable to dump actors state
Remove instance variables and accesssor for managers in Datapath
Also delete flows with the datapath cookie when uninstalling
Fix logging of crashed actor
Refactor TunnelManager
Fix a spec
Revert "Remove instance variables and accesssor for managers in Datapath"

This reverts commit 63052076916b83b904b035b3d10385572e2de2cf.
Remove instance variables and accessors for managers from Datapath
Add options to NodeApi
* raise_on_error
* logger
Add some supports to Vnet::NodeApi

raise_on_error: Whether to raise an error instead of returning nil on a
error
logger: the logger used in NodeApi
Refactor spec