[OpenStack] region should not be required

[bpo]

Trying out the OpenStack provider, this seemed a bit confusing to me. The region field is required for several resources in the OS provider, e.g. this will fail validation:

resource "openstack_compute_instance_v2" "test-server" {
  name = "tf-test"
  image_id = "${var.imageid}"
  flavor_name = "m1.small"
  key_pair = "${var.keypair}"
  #region = ""
}

I would have expected this value to just default to the empty string. Region specification (and/or the env variable OS_REGION_NAME) is not required by OpenStack or most clients - including nova.

The workaround if you don't have a region is just to uncomment the last line in the config and set the region field to an empty string explicitly on all resources.

[mitchellh]

Fixed by #1490

[ghost]

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