This patch creates a new driver using NB DB information instead of
SB DB. This has 2 objective:
- Alleviate the stress on big scale environment due to many
connections to the SB DBs.
- Being more future proof as content generated in the SB DBs based
on NB DB information is subject to change. For example we were
already adviced that the information we are currently using for
ovn LB events at the SB DB is probably going to change soon.
Depends-On: https://review.opendev.org/c/openstack/ovsdbapp/+/873853
Change-Id: Ib6bf077ce1e354652f5b728bd7192c762d3d071b
cb978dc244