cliff-3.4.0 creates a race

[Sergii Golovatiuk]

virtualenv clifftest
source clifftest/bin/activate
pip install python-openstackclient python-ironicclient
openstack --os-cloud undercloud baremetal node list -f value -c "Provisioning State"

# Install python-tripleoclient
pip install python-tripleoclient
# Now output changes for command, some INFO messages are dumped:-
openstack --os-cloud undercloud baremetal node list -f value -c "Provisioning State"
2020-08-05 06:43:10.788 776951 INFO osc_lib.shell [-] command: baremetal node list -> ironicclient.osc.v1.baremetal_node.ListBaremetalNode (auth=True)
2020-08-05 06:43:10.790 776951 INFO osc_lib.clientmanager [-] Using auth plugin: password
2020-08-05 06:43:11.264 776951 INFO osc_lib.shell [-] END return value: 0

# Issue not specific to baremetal, all commands are impacted like
openstack --os-cloud undercloud network list
2020-08-05 06:45:28.404 780181 INFO osc_lib.shell [-] command: network list -> openstackclient.network.v2.network.ListNetwork (auth=True)
2020-08-05 06:45:28.405 780181 INFO osc_lib.clientmanager [-] Using auth plugin: password
/home/zuul/clifftest/lib/python3.6/site-packages/openstack/resource.py:351: DeprecationWarning: inspect.getargspec() is deprecated since Python 3.0, use inspect.signature() or inspect.getfullargspec()
  len(inspect.getargspec(type_).args) > 1)
+--------------------------------------+----------+--------------------------------------+
| ID | Name | Subnets |
+--------------------------------------+----------+--------------------------------------+
| 5cfe57fb-6520-429a-844a-06d57a835259 | ctlplane | dc35e3e7-713a-46fb-b792-3bd003ffda02 |
+--------------------------------------+----------+--------------------------------------+
2020-08-05 06:45:29.002 780181 INFO osc_lib.shell [-] END return value: 0

# If tripleoclient is removed from venv or cliff is downgraded to 3.3.0, issue no longer happens. There is only 1 commit in 3.4.0 which switches to importlib-metadata:- https://github.com/openstack/cliff/compare/3.3.0...3.4.0