provider/openstack: Change Port fixed_ip to a Set

[jtopjian]

This commit changes the openstack_networking_port_v2 fixed_ip
parameter from a List to a Set. This is because OpenStack does not
preserve the original ordering of the fixed IPs.

Fixes #12110

[stack72]

LGTM!

[sebastien-prudhomme]

Hi, this should be marked as a breaking change. All my configurations are broken as i use things like that:

resource "openstack_networking_port_v2" "myproject" {
  admin_state_up = "true"
  name           = myproject"
  network_id     = "${var.network_id}"

  security_group_ids = [
    "${var.secgroup_icmp_id}",
    "${var.secgroup_ssh_id}",
    "${var.secgroup_http_id}",
    "${var.secgroup_https_id}",
  ]
}

and later

myvalue = "${openstack_networking_port_v2.myproject.fixed_ip.0.ip_address}"

${openstack_networking_port_v2.myproject.fixed_ip.0.ip_address} is no more working and didn't find a way yet to access the unique fixed ip address automatically affected to the port.

[jtopjian]

@sebastien-prudhomme Yeah, that's a good point. I can see how this would have been used for situations where a single fixed IP was specified. This wouldn't have had consistent results with more than one fixed IP, though.

I think tracking down the fixed IP is a valid thing to do. I will look into how to best do this ASAP.

[ghost]

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