neutron ovs agent has to handle advanced packet_in
with custom userdata which is necessary to openflow-based
floating IP implementation, but current os-ken doesn't
have such infrastructure.
This story is to enhance os-ken in order that neutron ovs
agent can act as an advanced SDN controller to handle
advanced packet_in.
Story: #2008964
Task: #42600
Related-Bug: #1931953
Signed-off-by: Yi Yang <yangyi01@inspur.com>
Change-Id: I4f993be5dd4a5f48396c4be152da5b61ea92392f