Add Neutron network id to OVN LRPs
This patch is adding an external_id to the Logical_Router_Port
rows including the Neutron network ID.
The reason for this is that if we consume Octavia from Stein+ in
Rocky/Queens, this external id is missing and the OVN Octavia
driver (octavia_api) will not be able to apply the Load Balancers
to all the Logical Switches and Logical Routers where needed.
Note: This is a partial cherry-pick from
https://review.opendev.org/#/c/668397/ since Octavia itself
does not exist in stable/queens but can be made to work
with neutron's stable/queens.
Co-Authored-By: Daniel Alvarez <firstname.lastname@example.org>
(cherry picked from commit