Fix an error on generating configs

In oslo log library, some attributes have moved to a new module.
This commit updated the location of the attributes.

Change-Id: I1c37a00a7611b30d63a28a593065141a1e82b6c9
Closes-Bug: 1464916

magnum/opts.py

@@ -40,10 +40,10 @@ def list_opts():
                          magnum.common.utils.UTILS_OPTS,
                          (magnum.openstack.common.eventlet_backdoor
                           .eventlet_backdoor_opts),
-                         log.generic_log_opts,
-                         log.log_opts,
-                         log.common_cli_opts,
-                         log.logging_cli_opts,
+                         log._options.generic_log_opts,
+                         log._options.log_opts,
+                         log._options.common_cli_opts,
+                         log._options.logging_cli_opts,
                          magnum.openstack.common.periodic_task.periodic_opts,
                          )),
         ('api', magnum.api.app.API_SERVICE_OPTS),