Add functional tests for metadata agent

[Oleg Bondarev]

As per discussion on https://review.openstack.org/#/c/121782/8/neutron/tests/unit/test_metadata_agent.py:

Tests could do something like sending an HTTP request to a proxy, while mocking the API (and then potential RPC, if rpc is merged in metadata agent) response, then assertiwg that the agent forwarded the correct HTTP request to Nova.

[Armando Migliaccio (armando-migliaccio)]

This bug is > 180 days without activity. We are unsetting assignee and milestone and setting status to Incomplete in order to allow its expiry in 60 days.

If the bug is still valid, then update the bug status.

[Ihar Hrachyshka (ihar-hrachyshka)]

We have tests for proxy: neutron/tests/functional/agent/l3/test_metadata_proxy.py but not agent side.

[Elvira García Ruiz (elviragr)]

Wondering if this bug was completed after ./neutron/tests/functional/agent/ovn/metadata/test_metadata_agent.py addition.

[Terry Wilson (otherwiseguy)]

I think it is. I'm getting ready to add a patch that fixes some of them to support OVN versions that have the Chassis_Private table, which don't fail in the gate but do fail for me running centos-stream.

[Rodolfo Alonso (rodolfo-alonso-hernandez)]

Hi Terry, is this bug still valid?