Return dummy numa_topology

community commit 9afb264151998baaa921a034219da3b8e17347e0
removed hacking on compute layer, so we need to return
dummy numa_topology so that the validation won't fail.

Change-Id: I58da3ec50ca7090a7e232c07c078800d7c1d69e9

nova/virt/zvm/driver.py

@@ -1019,6 +1019,7 @@ class ZVMDriver(driver.ComputeDriver):
             'cpu_info': jsonutils.dumps(stats['cpu_info']),
             'disk_available_least': stats['disk_available'],
             'supported_instances': jsonutils.dumps(supported_instances),
+            'numa_topology': None,
         }
 
         return dic