undercloud upgrade fails with "got an unexpected keyword argument 'constructor'

Issue

2020-11-11 18:34:24,033 INFO: + '[' -n '' ']'
2020-11-11 18:34:24,033 INFO: + exit 0
2020-11-11 18:34:24,036 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 99-refresh-completed completed
2020-11-11 18:34:24,037 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 ----------------------- PROFILING -----------------------
2020-11-11 18:34:24,039 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020
2020-11-11 18:34:24,041 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 Target: post-configure.d
2020-11-11 18:34:24,042 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020
2020-11-11 18:34:24,043 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 Script                                     Seconds
2020-11-11 18:34:24,045 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 ---------------------------------------  ----------
2020-11-11 18:34:24,046 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020
2020-11-11 18:34:24,055 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 10-iptables                                   0.006
2020-11-11 18:34:24,061 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 80-seedstack-masquerade                       0.040
2020-11-11 18:34:24,067 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 98-undercloud-setup                           6.585
2020-11-11 18:34:24,073 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 99-refresh-completed                          0.449
2020-11-11 18:34:24,075 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020
2020-11-11 18:34:24,077 INFO: dib-run-parts Wed Nov 11 18:34:24 UTC 2020 --------------------- END PROFILING ---------------------
2020-11-11 18:34:24,077 INFO: [2020-11-11 18:34:24,077] (os-refresh-config) [INFO] Completed phase post-configure
2020-11-11 18:34:24,087 INFO: os-refresh-config completed successfully
2020-11-11 18:34:24,743 INFO: Network create/update failed get_session_client() got an unexpected keyword argument 'constructor'
2020-11-11 18:34:24,743 DEBUG: An exception occurred
Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 2455, in install
    _post_config(instack_env, upgrade)
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 2128, in _post_config
    network = _ensure_neutron_network(sdk)
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 2174, in _ensure_neutron_network
    network = list(sdk.network.networks(name=PHYSICAL_NETWORK))
  File "/usr/lib/python2.7/site-packages/openstack/service_description.py", line 95, in __get__
    allow_version_hack=True,
TypeError: get_session_client() got an unexpected keyword argument 'constructor'
2020-11-11 18:34:24,743 ERROR:
#############################################################################
Undercloud install failed.

Reason: get_session_client() got an unexpected keyword argument 'constructor'

See the previous output for details about what went wrong.  The full install
log can be found at /home/stack/.instack/install-undercloud.log.

#############################################################################

Command 'instack-install-undercloud' returned non-zero exit status 1