This task is tracking the test case writing activities to cover the feature request described below.

1. Proposed title of this feature request:

Ensure that OVN does not delete patch ports created manually on br-int

2. What is the nature and description of the request?

In OpenStack and NFV use case, sometime we want to manually create an additional Open vSwitch and connect it to br-int via patch ports in order to transfer and capture packets.

In the current OVN implementation, OVN doesn't delete patch ports manually created on br-int unless it has "ovn-localnet-port" key.
However, there are no guarantee that OVN keeps the same behavior.

This RFE is raised in order to ensure that OVN won't delete such patch ports manually created on br-int even in the future releases.

3. Why does the customer need this? (List the business requirements here)

In OpenStack and NFV use case, it is one of the daily activities to transfer and capture packets.
To do it, we need to create patch ports on br-int.
However, if OVN automatically delete the manually created patch ports, the packet transfer will be disturbed.
We want to prevent this.

4. List any affected packages or components.

OVN