update a dict rather than overwriting it

scripts/make_inventory.py

@@ -34,9 +34,11 @@ def gatherInfo(md_key,md_value,authDict,project_id,inventory):
                 if groupName not in inventory: inventory[groupName] = []
                 inventory[groupName].append(hostname)
             # Add other metadata
+            if not hostname in inventory['_meta']['hostvars']:
+                inventory['_meta']['hostvars'][hostname] = {}
             for md in server.metadata.items():
                 if md[0] not in (md_key,'ansible_host_groups'):
-                    inventory['_meta']['hostvars'][hostname] = { md[0]:md[1] }
+                    inventory['_meta']['hostvars'][hostname].update({ md[0]:md[1] })
             if novaVolumes:
                 volDict = {}    
                 for volume in novaVolumes: