provider/openstack: Add allowed_address_pairs

[FedericoCeratto]

Based on #5076

[jtopjian]

@FedericoCeratto Thanks for this. Let me know when this is ready for a review. :)

[FedericoCeratto]

@jtopjian the PR is essentially ready as it is, unless acceptance tests are required (I'm having some trouble running the tests)

[jtopjian]

It looks like you added a test for the import functionality, and I don't think that specific test is adding anything more to what was already being tested.

Acceptance tests are not required - I can always merge this and add one post-merge.

If this is ready to go, I'd say remove the import test and then squash everything into one commit.

[FedericoCeratto]

@jtopjian the test was already in place, I populated the testAccNetworkingV2Port_basic variable.

[jtopjian]

That's already done here so it's not required.

[jtopjian]

@FedericoCeratto sorry for the delay. Thank you very much for this!

[ghost]

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