Description of problem:

It fails with (e.g. from [1][2]):

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/otopi/context.py", line 132, in _executeMethod
    method['method']()
  File "/usr/share/ovirt-engine/setup/bin/../plugins/ovirt-engine-setup/ovirt-engine-common/distro-rpm/packages.py", line 322, in _setup
    osetuputil.getPackageManager(self.logger)
  File "/usr/share/ovirt-engine/setup/ovirt_engine_setup/util.py", line 265, in getPackageManager
    'No supported package manager found in your system'
RuntimeError: No supported package manager found in your system

This is due to code in otopi that disables dnf if the OS verion is not at least >= '8.0'. CentOS Stream reports '8'. With a patch it to require >= '8' [3], it fails with [4][5]:

2020-12-16 21:48:33,353+0000 ERROR otopi.plugins.otopi.packagers.dnfpackager dnfpackager.error:84 DNF Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist
2020-12-16 21:48:33,355+0000 DEBUG otopi.context context._executeMethod:145 method exception
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 574, in load
    ret = self._repo.load()
  File "/usr/lib64/python3.6/site-packages/libdnf/repo.py", line 397, in load
    return _repo.Repo_load(self)
libdnf._error.Error: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/otopi/context.py", line 132, in _executeMethod
    method['method']()
  File "/usr/share/otopi/plugins/otopi/packagers/dnfpackager.py", line 205, in _setup
    with self._minidnf.transaction():
  File "/usr/lib/python3.6/site-packages/otopi/minidnf.py", line 291, in __enter__
    self._managed.beginTransaction()
  File "/usr/lib/python3.6/site-packages/otopi/minidnf.py", line 562, in beginTransaction
    self._base = self._createBase()
  File "/usr/lib/python3.6/site-packages/otopi/minidnf.py", line 351, in _createBase
    base.fill_sack()
  File "/usr/lib/python3.6/site-packages/dnf/base.py", line 392, in fill_sack
    self._add_repo_to_sack(r)
  File "/usr/lib/python3.6/site-packages/dnf/base.py", line 137, in _add_repo_to_sack
    repo.load()
  File "/usr/lib/python3.6/site-packages/dnf/repo.py", line 581, in load
    raise dnf.exceptions.RepoError(str(e))
dnf.exceptions.RepoError: Failed to download metadata for repo 'appstream': Cannot prepare internal mirrorlist: No URLs in mirrorlist

[1] https://jenkins.ovirt.org/job/ovirt-system-tests_he-basic-suite-master/1853/

[2] https://jenkins.ovirt.org/job/ovirt-system-tests_he-basic-suite-master/1853/artifact/exported-artifacts/test_logs/he-basic-suite-master/post-he_deploy/lago-he-basic-suite-master-host-0/_var_log/ovirt-hosted-engine-setup/engine-logs-2020-12-17T02%3A18%3A09Z/ovirt-engine/setup/ovirt-engine-setup-20201217031711-6m07d0.log

[3] https://gerrit.ovirt.org/c/otopi/+/112682

[4] https://jenkins.ovirt.org/job/otopi_standard-check-patch/340/

[5] https://jenkins.ovirt.org/job/otopi_standard-check-patch/340/artifact/check-patch.el8.x86_64/logs/otopi-packager-stream-20201216214830-kay532.log