[Bug 1988577] Fix included in openstack/neutron 19.6.0

[OpenStack Infra]

This issue was fixed in the openstack/neutron 19.6.0  release.

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https://bugs.launchpad.net/bugs/1988577

Title:
  [OVN] neutron-ovn-db-sync-util fails without qos extension driver

Status in neutron:
  Fix Released
Status in neutron package in Ubuntu:
  Confirmed

Bug description:
  Running neutron-ovn-db-sync-util with the following
  `extension_drivers=port_security` fails with

   CRITICAL neutron_ovn_db_sync_util [req-9697a0e0-6097-4d8c-a24b-2c86b6921d7f - - - - -] Unhandled error: neutron.plugins.ml2.common.exceptions.ExtensionDriverNotFound: Extension driver qos required for service plugin qos not found.
   ERROR neutron_ovn_db_sync_util Traceback (most recent call last):
   ERROR neutron_ovn_db_sync_util   File "/usr/lib/python3.8/runpy.py", line 194, in _run_module_as_main
   ERROR neutron_ovn_db_sync_util     return _run_code(code, main_globals, None,
   ERROR neutron_ovn_db_sync_util   File "/usr/lib/python3.8/runpy.py", line 87, in _run_code
   ERROR neutron_ovn_db_sync_util     exec(code, run_globals)
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/lib/python3.8/site-packages/debugpy/__main__.py", line 39, in <module>
   ERROR neutron_ovn_db_sync_util     cli.main()
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/lib/python3.8/site-packages/debugpy/server/cli.py", line 430, in main
   ERROR neutron_ovn_db_sync_util     run()
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/lib/python3.8/site-packages/debugpy/server/cli.py", line 284, in run_file
   ERROR neutron_ovn_db_sync_util     runpy.run_path(target, run_name="__main__")
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/lib/python3.8/site-packages/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 321, in run_path
   ERROR neutron_ovn_db_sync_util     return _run_module_code(code, init_globals, run_name,
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/lib/python3.8/site-packages/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 135, in _run_module_code
   ERROR neutron_ovn_db_sync_util     _run_code(code, mod_globals, init_globals,
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/lib/python3.8/site-packages/debugpy/_vendored/pydevd/_pydevd_bundle/pydevd_runpy.py", line 124, in _run_code
   ERROR neutron_ovn_db_sync_util     exec(code, run_globals)
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/bin/neutron-ovn-db-sync-util", line 10, in <module>
   ERROR neutron_ovn_db_sync_util     sys.exit(main())
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/cmd/ovn/neutron_ovn_db_sync_util.py", line 222, in main
   ERROR neutron_ovn_db_sync_util     manager.init()
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/manager.py", line 301, in init
   ERROR neutron_ovn_db_sync_util     NeutronManager.get_instance()
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/manager.py", line 252, in get_instance
   ERROR neutron_ovn_db_sync_util     cls._create_instance()
   ERROR neutron_ovn_db_sync_util   File "/opt/xena/lib/python3.8/site-packages/oslo_concurrency/lockutils.py", line 360, in inner
   ERROR neutron_ovn_db_sync_util     return f(*args, **kwargs)
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/manager.py", line 238, in _create_instance
   ERROR neutron_ovn_db_sync_util     cls._instance = cls()
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/manager.py", line 126, in __init__
   ERROR neutron_ovn_db_sync_util     plugin = self._get_plugin_instance(CORE_PLUGINS_NAMESPACE,
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/manager.py", line 162, in _get_plugin_instance
   ERROR neutron_ovn_db_sync_util     plugin_inst = plugin_class()
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/quota/resource_registry.py", line 124, in wrapper
   ERROR neutron_ovn_db_sync_util     return f(*args, **kwargs)
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/plugins/ml2/plugin.py", line 279, in __init__
   ERROR neutron_ovn_db_sync_util     self._verify_service_plugins_requirements()
   ERROR neutron_ovn_db_sync_util   File "/opt/neutron/neutron/plugins/ml2/plugin.py", line 311, in _verify_service_plugins_requirements
   ERROR neutron_ovn_db_sync_util     raise ml2_exc.ExtensionDriverNotFound(
   ERROR neutron_ovn_db_sync_util neutron.plugins.ml2.common.exceptions.ExtensionDriverNotFound: Extension driver qos required for service plugin qos not found.
   ERROR neutron_ovn_db_sync_util

  I tracked it down to
  https://opendev.org/openstack/neutron/src/commit/429fbae1d0e835f7282040f59a71c2fcb9fa7a7d/neutron/cmd/ovn/neutron_ovn_db_sync_util.py#L203
  where qos is added to `conf.service_plugins` regardless whether I have
  qos in my deployment.

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