imageservice: Include version for glance api calls

The default glance installation[1] builds the image service endpoints
without the version suffix, so we have to add a v2 to them from
NewImageService()

[1] http://docs.openstack.org/mitaka/install-guide-ubuntu/glance-install.html

Signed-off-by: Alberto Murillo <alberto.murillo.silva@intel.com>

Author: Alberto Murillo

openstack/client.go

@@ -352,5 +352,7 @@ func NewImageServiceV2(client *gophercloud.ProviderClient, eo gophercloud.Endpoi
 	if err != nil {
 		return nil, err
 	}
-	return &gophercloud.ServiceClient{ProviderClient: client, Endpoint: url}, nil
+	return &gophercloud.ServiceClient{ProviderClient: client,
+		Endpoint:     url,
+		ResourceBase: url + "v2/"}, nil
 }