provider/openstack Changing the port resource to mark the ip_address as optional

[Sheile]

According to API reference of openstack, ip_address attribute of port resource is optional.
http://developer.openstack.org/api-ref-networking-v2.html#createPort

[jtopjian]

Thanks for both PRs 😄

I should have time to look at them in detail within the next day.

[jtopjian]

@Sheile I just opened PR against this branch to clean up a few items. Most notably is the ability to read the IP address that is assigned. Let me know if you have any questions.

[jtopjian]

Oh duh, nevermind. I see that #4851 is exactly the same work I did! Oh well, it was a good exercise :)

I'll merge these in and add the acceptance test I created in another PR.

[ghost]

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