Check both stdout and stderr in package manager tests

We don't care that much where `dnf` puts the info about which
packages were installed. Plus in different `dnf` versions the
output goes into different output streams. See also:

* rpm-software-management/dnf5#1641

tests/unit/test_package_managers.py

@@ -781,7 +781,7 @@ def test_install_dont_check_first(
 
 
 def _parametrize_test_reinstall() -> Iterator[tuple[
-        Container, PackageManagerClass, Optional[str], Optional[str], Optional[str]]]:
+        Container, PackageManagerClass, Optional[str], Optional[str]]]:
 
     for container, package_manager_class in CONTAINER_BASE_MATRIX:
         if package_manager_class is tmt.package_managers.dnf.Yum:
@@ -791,52 +791,46 @@ def _parametrize_test_reinstall() -> Iterator[tuple[
                     Package('tar'), \
                     True, \
                     r"rpm -q --whatprovides tar && yum reinstall -y  tar && rpm -q --whatprovides tar", \
-                    'Reinstalling:\n tar', \
-                    None  # noqa: E501
+                    'Reinstalling:\n tar'  # noqa: E501
 
             else:
                 yield container, \
                     package_manager_class, \
                     Package('tar'), \
                     True, \
                     r"rpm -q --whatprovides tar && yum reinstall -y  tar && rpm -q --whatprovides tar", \
-                    'Reinstalled:\n  tar', \
-                    None  # noqa: E501
+                    'Reinstalled:\n  tar'  # noqa: E501
 
         elif package_manager_class is tmt.package_managers.dnf.Dnf:
             yield container, \
                 package_manager_class, \
                 Package('tar'), \
                 True, \
                 r"rpm -q --whatprovides tar && dnf reinstall -y  tar", \
-                'Reinstalled:\n  tar', \
-                None
+                'Reinstalled:\n  tar'
 
         elif package_manager_class is tmt.package_managers.dnf.Dnf5:
             yield container, \
                 package_manager_class, \
                 Package('tar'), \
                 True, \
                 r"rpm -q --whatprovides tar && dnf5 reinstall -y  tar", \
-                'Reinstalling tar', \
-                None
+                'Reinstalling tar'
 
         elif package_manager_class is tmt.package_managers.apt.Apt:
             yield container, \
                 package_manager_class, \
                 Package('tar'), \
                 True, \
                 r"export DEBIAN_FRONTEND=noninteractive; dpkg-query --show tar && apt reinstall -y  tar", \
-                'Setting up tar', \
-                None  # noqa: E501
+                'Setting up tar'  # noqa: E501
 
         elif package_manager_class is tmt.package_managers.rpm_ostree.RpmOstree:
             yield container, \
                 package_manager_class, \
                 Package('tar'), \
                 False, \
                 None, \
-                None, \
                 None
 
         elif package_manager_class is tmt.package_managers.apk.Apk:
@@ -845,8 +839,7 @@ def _parametrize_test_reinstall() -> Iterator[tuple[
                 Package('bash'), \
                 True, \
                 r"apk info -e bash && apk fix bash", \
-                'Reinstalling bash', \
-                None
+                'Reinstalling bash'
 
         else:
             pytest.fail(f"Unhandled package manager class '{package_manager_class}'.")
@@ -858,8 +851,7 @@ def _parametrize_test_reinstall() -> Iterator[tuple[
                           'package',
                           'supported',
                           'expected_command',
-                          'expected_stdout',
-                          'expected_stderr'),
+                          'expected_output'),
                          list(_parametrize_test_reinstall()),
                          indirect=["container_per_test"],
                          ids=CONTAINER_MATRIX_IDS)
@@ -870,8 +862,7 @@ def test_reinstall(
         package: Package,
         supported: bool,
         expected_command: Optional[str],
-        expected_stdout: Optional[str],
-        expected_stderr: Optional[str],
+        expected_output: Optional[str],
         root_logger: tmt.log.Logger,
         caplog: _pytest.logging.LogCaptureFixture) -> None:
     package_manager = create_package_manager(
@@ -895,13 +886,9 @@ def test_reinstall(
         assert excinfo.value.message \
             == "rpm-ostree does not support reinstall operation."
 
-    if expected_stdout:
-        assert output.stdout is not None
-        assert expected_stdout in output.stdout
-
-    if expected_stderr:
-        assert output.stderr is not None
-        assert expected_stderr in output.stderr
+    if expected_output:
+        assert output.stdout is not None or output.stderr is not None
+        assert expected_output in output.stdout or expected_output in output.stderr
 
 
 def _generate_test_reinstall_nonexistent_matrix() -> Iterator[tuple[