Port: add propagationUplinkStatus field

[winiciusallan]

This PR introduces the propagationUplinkStatus

https://docs.openstack.org/api-ref/network/v2/index.html#uplink-status-propagation

Notes:

• I've decided to keep the default value for that field as false, even if the doc says that the default value is true. The reason is that in environments where this extension is not enabled, we can't update that field and it always returns false, so if we enforce it as true, it may raise an error. So if the user wants to enable it, they must explicitly define it.

Partial #616

[winiciusallan]

weird... the uplink_status_propagation extension was not added to the devstack deployment. I tested locally and it only works by setting Q_ML2_PLUGIN_EXT_DRIVERS directly.

Has anyone ever seen something like this?

[winiciusallan]

Ok, here we go. I needed to add the neutron plugin on CI so that devstack can run this line and enable uplink-status-propagation accordingly. However, it looks like that Dalmatian release doesn't enable the ability to update propagateUplinkStatus by default on Devstack like did in newer releases, so the CI ended up failing. I believe that adding a line explicitly enabling uplink_status_propagation_updatable extension should work.

About the job failing on Flamingo I really don't get the why. The E2E job has failed in domain-import-error tests.

cc. @mandre I'll wait for you feedback before making any additional change.