ci: Workaround for ip netns bug in container.

Due to `ip netns` issue in https://github.com/containers/podman/issues/11887 ,
`ip netns exec` will fail in podman container.

To workaround it, mount another sysfs to random folder workaround this
problem.

Signed-off-by: Gris Ge <fge@redhat.com>

tests/integration/conftest.py

@@ -20,6 +20,7 @@
 import logging
 import os
 import subprocess
+import tempfile
 import warnings
 
 import pytest
@@ -70,6 +71,20 @@ def _mark_tier2_tests(items):
             item.add_marker(pytest.mark.tier2)
 
 
+@pytest.fixture(scope="session", autouse=True)
+def fix_ip_netns_issue(scope="session", autouse=True):
+    if os.getenv("CI"):
+        with tempfile.TemporaryDirectory() as tmpdirname:
+            subprocess.run(
+                f"mount -t sysfs --make-private {tmpdirname}".split(),
+                check=True,
+            )
+            yield
+            subprocess.run(f"umount {tmpdirname}".split())
+    else:
+        yield
+
+
 @pytest.fixture(scope="session", autouse=True)
 def test_env_setup():
     _logging_setup()