Added test case to make sure when teamd feature/service is stop kernel device is cleanup and SIGTERM are handled gracefully

tests/pc/test_po_cleanup.py

@@ -0,0 +1,61 @@
+import pytest
+import logging
+from tests.common.utilities import wait_until
+from tests.common import config_reload
+
+
+pytestmark = [
+    pytest.mark.topology('any'),
+]
+
+@pytest.fixture(autouse=True)
+def ignore_expected_loganalyzer_exceptions(duthost, loganalyzer):
+    """
+        Ignore expected failures logs during test execution.
+
+        LAG tests are triggering following syncd complaints but the don't cause
+        harm to DUT.
+
+        Args:
+            duthost: DUT fixture
+            loganalyzer: Loganalyzer utility fixture
+    """
+    # when loganalyzer is disabled, the object could be None
+    if loganalyzer:
+        ignoreRegex = [
+            ".*",
+        ]
+        loganalyzer.ignore_regex.extend(ignoreRegex)
+        expectRegex = [
+            ".*teamd#teammgrd: :- cleanTeamProcesses.*",
+            ".*teamd#teamsyncd: :- cleanTeamSync.*"
+        ]
+        loganalyzer.expect_regex.extend(expectRegex)
+
+
+def check_kernel_po_interface_cleaned(duthost):
+    res = duthost.shell("ip link show | grep -c PortChannel",  module_ignore_errors=True)["stdout_lines"][0].decode("utf-8")
+    return res == '0'
+
+
+def test_po_cleanup(duthost):
+    """
+    test port channel are cleaned up correctly and teammgrd and teamsyncd process
+    handle  SIGTERM gracefully
+    """
+    mg_facts = duthost.minigraph_facts(host=duthost.hostname)['ansible_facts']
+
+    if len(mg_facts['minigraph_portchannels'].keys()) == 0:
+        pytest.skip("Skip test due to there is no portchannel exists in current topology.")
+
+    try:
+        logging.info("Disable Teamd Feature")
+        duthost.shell("sudo config feature state teamd disabled")
+        # Check if Linux Kernel Portchannel Interface teamdev are clean up
+        if not wait_until(10, 1, check_kernel_po_interface_cleaned, duthost):
+            fail_msg = "PortChannel interface still exists in kernel"
+            pytest.fail(fail_msg)
+    finally:
+        # Do config reload to restor everything back
+        logging.info("Reloading config..")
+        config_reload(duthost)