linters: Mock additional variables in validate-all-file.py

The linters job started failing, due to a dependency change.

Change-Id: Ibab350ecf6d9551da8e9c8b704693122cec11559

tools/validate-all-file.py

@@ -123,8 +123,11 @@ def check_json_j2():
         context = {
             'hostvars': hostvars(),
             'groups': groups(),
+            'inventory_hostname': 'hostname',
+            'api_interface_address': '',
+            'kolla_internal_fqdn': '',
+            'octavia_provider_drivers': '',
             'storage_interface': 'storage_interface',
-            'inventory_hostname': 'hostname'
         }
         data = template.render(**context)
         json.loads(data)