openstack: Set GetZone FailureDomain to nova AZ

Set FailureDomain in GetZone result to value of availability_zone in
local instance metadata.

pkg/cloudprovider/providers/openstack/openstack.go

@@ -395,9 +395,18 @@ func (os *OpenStack) Zones() (cloudprovider.Zones, bool) {
 	return os, true
 }
 func (os *OpenStack) GetZone() (cloudprovider.Zone, error) {
-	glog.V(1).Infof("Current zone is %v", os.region)
+	md, err := getMetadata()
+	if err != nil {
+		return cloudprovider.Zone{}, err
+	}
 
-	return cloudprovider.Zone{Region: os.region}, nil
+	zone := cloudprovider.Zone{
+		FailureDomain: md.AvailabilityZone,
+		Region:        os.region,
+	}
+	glog.V(1).Infof("Current zone is %v", zone)
+
+	return zone, nil
 }
 
 func (os *OpenStack) Routes() (cloudprovider.Routes, bool) {

pkg/cloudprovider/providers/openstack/openstack_test.go

@@ -232,6 +232,9 @@ func TestLoadBalancer(t *testing.T) {
 }
 
 func TestZones(t *testing.T) {
+	SetMetadataFixture(&FakeMetadata)
+	defer ClearMetadata()
+
 	os := OpenStack{
 		provider: &gophercloud.ProviderClient{
 			IdentityBase: "http://auth.url/",
@@ -252,6 +255,10 @@ func TestZones(t *testing.T) {
 	if zone.Region != "myRegion" {
 		t.Fatalf("GetZone() returned wrong region (%s)", zone.Region)
 	}
+
+	if zone.FailureDomain != "nova" {
+		t.Fatalf("GetZone() returned wrong failure domain (%s)", zone.FailureDomain)
+	}
 }
 
 func TestVolumes(t *testing.T) {