In order to support out of tree interface drivers it is required
to pass a callback to allow the drivers to query information about
the network.
- Allow passing **kwargs to interface drivers
- Pass get_networks() as `get_networks_cb` kw arg
`get_networks_cb` has the same API as
`neutron.neutron_plugin_base_v2.NeutronPluginBaseV2.get_networks()`
minus the the request context which will be embeded in the callback
itself.
The out of tree interface drivers in question are:
MultiInterfaceDriver - a per-physnet interface driver that delegates
operations on a per-physnet basis.
IPoIBInterfaceDriver - an interface driver for IPoIB (IP over Infiniband)
networks.
Those drivers are a part of networking-mlnx[1], Their implementation
is vendor agnostic so they can later be moved to a more common place
if desired.
[1] https://github.com/openstack/networking-mlnx
Change-Id: I74d9f449fb24f64548b0f6db4d5562f7447efb25
Closes-Bug: #1834176
0e80d2251e