remove plugin sections from reno config

* we'll generate those at runtime using plugin metadata instead of trying to cobble together from sections

changelogs/config.yaml

@@ -8,11 +8,5 @@ sections:
 - ['minor_changes', 'Minor Changes']
 - ['deprecated_features', 'Deprecated Features']
 - ['removed_features', 'Removed Features (previously deprecated)']
-- ['new_lookup_plugins', 'New Lookup Plugins']
-- ['new_callback_plugins', 'New Callback Plugins']
-- ['new_connection_plugins', 'New Connection Plugins']
-- ['new_test_plugins', 'New Test Plugins']
-- ['new_filter_plugins', 'New Filter Plugins']
-- ['new_modules', 'New Modules']
 - ['bugfixes', 'Bugfixes']
 - ['known_issues', 'Known Issues']