allow ML2 drivers to add informations to RPC messages

Registered by Mathieu Rohon

in ML2 plugin, Mechanism drivers and Type drivers should be able to add informations to RPC messages between the plugin and the L2 agents.
This BP has to get synchronized with this one :
https://blueprints.launchpad.net/neutron/+spec/ml2-typedriver-extra-port-info

Blueprint information

Status:
Complete
Approver:
Kyle Mestery
Priority:
Undefined
Drafter:
Mathieu Rohon
Direction:
Needs approval
Assignee:
None
Definition:
Obsolete
Series goal:
None
Implementation:
Unknown
Milestone target:
None
Completed by
Armando Migliaccio

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