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[Bug 1949097] [NEW] Cloud-Init cannot contact Meta-Data-Service on Xena with OVN

Public bug reported:

## Brief
When running Xena with OVN, neither debian nor cirros cloud-init bootstraps can reach the meta-data service during boot.

- Using Wallaby+OVN works.
- Using Xena+OVS works.

Assuming this must be a regression in Xena, when OVN is used

## Pre-Conditions:
- Xena
- OVN
- Cirros Cloud init boot

Reproduction:
You can use https://github.com/EugenMayer/openstack-lab/tree/stable/ovn and run 'make start' to setup a vagrant setup. Vanilla-Kolla is used to deploy, based on the kolla 'stable/xena' branches.

After the deployment the following API request should be run:
https://github.com/EugenMayer/openstack-
lab/blob/stable/ovn/README.setup.md

The booted cirros instance should already show the errors.

The exact same stack can be tested using wallaby here
https://github.com/EugenMayer/openstack-lab/blob/stable/ovn-wallaby - it
will work.

## Expected output:
The cirros instance can reach the meta-data service like that (boot logs)

--------
WARN: failed: route add -net "0.0.0.0/0" gw "10.10.0.1"
OK
checking http://169.254.169.254/2009-04-04/instance-id
successful after 1/20 tries: up 9.89. iid=i-00000002
failed to get http://169.254.169.254/2009-04-04/user-data
warning: no ec2 metadata for user-data
--------

## Actual Output
--------
route: SIOCADDRT: File exists
WARN: failed: route add -net "0.0.0.0/0" gw "10.10.0.1"
OK
checking http://169.254.169.254/2009-04-04/instance-id
failed 1/20: up 1.34. request failed
failed 2/20: up 50.36. request failed
failed 3/20: up 99.38. request failed
--------

## Version

Yet hard to understand for me, since those are not tagged yet.
What-ever https://github.com/openstack/kolla-ansible/tree/stable/xena deploys

## Severity

Blocks us from using Xena entirely

## More Informations

In the meta-data agent, i can see this configuration.
On the compute instance, i see those 2 running https://gist.github.com/EugenMayer/b6611b9725a7697d0a392c1b3c1a5683

Those are the debug logs https://gist.github.com/EugenMayer/e2c5796f7c547c224a3aaccad2c35257
Normal logs: https://gist.github.com/EugenMayer/bbda954d207fc03b1fd9ea0bb6d143cf

https://gist.github.com/EugenMayer/fda894a3c6bb2bde5b9d1756b234cd79

** Affects: neutron
Importance: Undecided
Status: New

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https://bugs.launchpad.net/bugs/1949097

Title:
Cloud-Init cannot contact Meta-Data-Service on Xena with OVN

Status in neutron:
New

Bug description:
## Brief
When running Xena with OVN, neither debian nor cirros cloud-init bootstraps can reach the meta-data service during boot.