🐛 Include more device_owners when looking for a port for floating ip

[bilbobrovall]

What this PR does / why we need it: Adds support in GetPortForExternalNetwork for more distributed/ha-routers

Which issue(s) this PR fixes: Fixes #1985

I'm not 100% sure if we need all these device_owners or if we need some additional, I got them from https://github.com/openstack/neutron-lib/blob/master/neutron_lib/constants.py#L74 but didn't find any good documentation on them.

Special notes for your reviewer:

1. Please confirm that if this PR changes any image versions, then that's the sole change this PR makes.

TODOs:

• [x] squashed commits
• if necessary:
  • [ ] includes documentation
  • [ ] adds unit tests

/hold

[k8s-ci-robot]

Hi @bilbobrovall. Thanks for your PR.

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[huxcrux]

/ok-to-test

[dulek]

Makes sense to me, tiny request for clarification in the comments.

/lgtm

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mdbooth

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[mdbooth]

/hold cancel