implement "openstack_networking_port_v2" resource

[JeanMertz]

A couple of notes:

• I didn't write any tests, because I apparently can't even break any tests. Whenever I change random test values in _test.go files, and run go test ./..., all tests still pass. As soon as I manage to get a test-workflow going, I will try my hand at the tests.
• I tested this on my own OpenStack environment, and things work as expected.
• It seems the resource mac_address value is "updated" on every run, if left unspecified. This is something I also mentioned in OpenStack: plan always shows changes to resource #1784 but I am unsure if it is a fault of my usage of Terraform, or the implementation.

[mitchellh]

@JeanMertz Are you running make testacc? go test will not run acceptance tests.

[mitchellh]

This LGTM. Let me know when you can get the tests passing.

[dupuy]

@catsby this issue could use a provider/openstack label...

[JeanMertz]

@mitchellh thanks for the heads up. I was under the impression that the _test.go files where unit-tests. I guess I didn't look at them thoroughly.

I'll work on the tests this weekend so this can be pulled.

[jtopjian]

@JeanMertz If you're interested, here's a Terraform configuration and build script to build out a devstack environment and run the suite of acceptance tests. You can tweak it as needed.

[josephholsten]

@JeanMertz did you ever get tests working? anything you need to finish this out?

[jtopjian]

Closing in favor of #3731. @JeanMertz's original commit is still included 😄

[JeanMertz]

Sorry for letting this linger guys. Awesome to see it getting picked up to the finish line 👍

[ghost]

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