Perform safe normalization of nics to use uuid

cloud/rax_scaling_group

@@ -215,8 +215,12 @@ def rax_asg(module, cooldown=300, disk_config=None, files={}, flavor=None,
                     nics.extend(cnw.get_server_networks(network))
 
             for nic in nics:
-                nic.update(uuid=nic['net-id'])
+                # pyrax is currently returning net-id, but we need uuid
-                del nic['net-id']
+                # this check makes this forward compatible for a time when
+                # pyrax uses uuid instead
+                if nic.get('net-id'):
+                    nic.update(uuid=nic['net-id'])
+                    del nic['net-id']
 
         # Handle the file contents
         personality = []