Katello 3.15 upgrade failure with "python3-django-admin migrate --noinput"

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OK, I found how the installer would run it, and:

# PULP_SETTINGS=/etc/pulp/settings.py DJANGO_SETTINGS_MODULE=pulpcore.app.settings python3-django-admin migrate --noinput
Traceback (most recent call last):
  File "/bin/python3-django-admin", line 11, in <module>
    load_entry_point('Django==2.2.10', 'console_scripts', 'django-admin')()
  File "/usr/lib/python3.6/site-packages/django/core/management/__init__.py", line 381, in execute_from_command_line
    utility.execute()
  File "/usr/lib/python3.6/site-packages/django/core/management/__init__.py", line 325, in execute
    settings.INSTALLED_APPS
  File "/usr/lib/python3.6/site-packages/django/conf/__init__.py", line 79, in __getattr__
    self._setup(name)
  File "/usr/lib/python3.6/site-packages/django/conf/__init__.py", line 66, in _setup
    self._wrapped = Settings(settings_module)
  File "/usr/lib/python3.6/site-packages/django/conf/__init__.py", line 157, in __init__
    mod = importlib.import_module(self.SETTINGS_MODULE)
  File "/usr/lib64/python3.6/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 994, in _gcd_import
  File "<frozen importlib._bootstrap>", line 971, in _find_and_load
  File "<frozen importlib._bootstrap>", line 955, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 665, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 678, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/usr/lib/python3.6/site-packages/pulpcore/app/settings.py", line 66, in <module>
    plugin_app_config = entry_point.load()
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2317, in load
    self.require(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2340, in require
    items = working_set.resolve(reqs, env, installer, extras=self.extras)
  File "/usr/lib/python3.6/site-packages/pkg_resources/__init__.py", line 779, in resolve
    raise VersionConflict(dist, req).with_context(dependent_req)
pkg_resources.ContextualVersionConflict: (redis 3.2.1 (/usr/local/lib/python3.6/site-packages), Requirement.parse('redis~=3.1.0'), {'pulpcore'})

and:

# rpm -qa |grep redis
python3-redis-3.1.0-1.el7.noarch
rh-redis5-redis-5.0.5-1.el7.x86_64
rh-redis5-runtime-3.3-1.el7.x86_64
tfm-rubygem-redis-4.1.2-1.el7.noarch
redis-3.2.12-2.el7.x86_64

So, I had a pip-installed version of the Python 3 redis package, version 3.2.1. I’m going to try uninstalling this…

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