Update api_fetch.go

The name by default in documentation is "nova".

http://docs.openstack.org/icehouse/install-guide/install/apt/content/nova-controller.html

This will allow proper selection when using packer.
diff --git a/api_fetch.go b/api_fetch.go
index 54ca9be..5cfa2da 100644
--- a/api_fetch.go
+++ b/api_fetch.go
@@ -6,6 +6,7 @@
 
 //The default generic openstack api
 var OpenstackApi = map[string]interface{}{
+        "Name":      "nova",
 	"UrlChoice": PublicURL,
 }