oslo-config-generator: Fix ValueError

This fixes how the opts data is formatted to fix auto-generation of
config file using oslo-config-generator with oslo.limit entry point.

Closes-Bug: #1962406
Change-Id: I176a7b2b8e2edb50659783a2139c3cc13e8f2f53
(cherry picked from commit ce5aa7dc)

oslo_limit/opts.py

@@ -44,9 +44,9 @@ def list_opts():
     return [(_option_group,
              copy.deepcopy(_options) +
              loading.get_session_conf_options() +
-             loading.get_auth_plugin_conf_options('password'),
-             loading.get_auth_plugin_conf_options('v2password'),
-             loading.get_auth_plugin_conf_options('v3password'),
+             loading.get_auth_plugin_conf_options('password') +
+             loading.get_auth_plugin_conf_options('v2password') +
+             loading.get_auth_plugin_conf_options('v3password') +
              loading.get_adapter_conf_options(include_deprecated=False)
              )]
 

releasenotes/notes/bug-1962406-e239d60400c726c8.yaml

+---
+fixes:
+  - |
+    `bug 1962406` <https://bugs.launchpad.net/oslo.limit/+bug/1962406>`_:
+    Fixed the wrong format of options data, which was causing failure with
+    ``oslo-config-generator`` command if the ``oslo.limit`` entry point is
+    included.