The current implementation doesn't correctly process some port-binding
attributes such as 'portbinding:profile' and 'portbinding:vif_details'.
This patch add the required support to process and persist the missing
port-binding information.
The new fields are modified and queried by nova, and will allow us to support
for SR-IOV passthrough networking.
In order to avoid DB migrations, this implementation will utilize the
existing 'ml2_port_bindings' table to hold the extra port binding information,
current tables that contains partial information (e.g - 'portbindingports'
for port's 'binding:host_id') will be kept and maintained by the plugin to
preserve backward compatibility.
Change-Id: I779b577737565860a53461114c9822d7b3908cb3
065ec89b91