Add safe_reload and interface check for process monitoring and container check tests (#16252)

Description of PR
Summary:
Notice quite a lot flaky failures on PR test,
https://elastictest.org/scheduler/testplan/676e75562c6c7b8d3e3bd8bf?testcase=process_monitoring%2Ftest_critical_process_monitoring.py&type=console
Simply wait for 120s is not enough for multi-asic kvm testbeds, enhance the config_reload to use safe_reload to make sure the testbed is healthy.

Approach
What is the motivation for this PR?
Notice quite a lot flaky failures on PR test,
https://elastictest.org/scheduler/testplan/676e75562c6c7b8d3e3bd8bf?testcase=process_monitoring%2Ftest_critical_process_monitoring.py&type=console

How did you do it?
Simply wait for 120s is not enough for multi-asic kvm testbeds, enhance the config_reload to use safe_reload to make sure the testbed is healthy.

How did you verify/test it?
PR test will verify it.

authorized by: [email protected]

Author: yejianquan

tests/container_checker/test_container_checker.py

@@ -49,7 +49,7 @@ def config_reload_after_tests(duthosts, selected_rand_one_per_hwsku_hostname):
     for hostname in selected_rand_one_per_hwsku_hostname:
         duthost = duthosts[hostname]
         logger.info("Reload config on DuT '{}' ...".format(duthost.hostname))
-        config_reload(duthost)
+        config_reload(duthost, safe_reload=True, check_intf_up_ports=True, wait_for_bgp=True)
         postcheck_critical_processes_status(duthost, up_bgp_neighbors[duthost])
 
 

tests/process_monitoring/test_critical_process_monitoring.py

@@ -37,7 +37,7 @@
 def config_reload_after_tests(duthosts, rand_one_dut_hostname):
     duthost = duthosts[rand_one_dut_hostname]
     yield
-    config_reload(duthost)
+    config_reload(duthost, safe_reload=True, check_intf_up_ports=True, wait_for_bgp=True)
 
 
 @pytest.fixture(autouse=True, scope='module')