Add a basic topology that allows the testing of BGP and zebra
at scale. I built this to help me find and fix problems with
a large number of bgp peers. Since I plan to keep using this
and as I understand it there are future plans to take this
higher, I would like to add this as a test that people can invoke
with this command:
sudo -E python3 -m pytest -s -vv --topology-only
Signed-off-by: Donald Sharp <sharpd@nvidia.com>