[Mellanox] Ignore checking ASIC/module temperature if thermal updater is there (#11165)

- Why I did it
thermal updater is a thread which will update ASIC/module thermal sysfs nodes periodically. Currently, there is no way to stop thermal updater. So, there is no easy way to mock thermal sysfs value if thermal updater is there (thermal updater will always override mocked values).

- How I did it
Ignore ASIC/module thermal mock test if thermal updater is present

- How to verify it
Manual test
sonic-mgmt regression test

Author: Junchao-Mellanox

tests/platform_tests/mellanox/mellanox_thermal_control_test_helper.py

@@ -1,5 +1,6 @@
 import os
 import json
+import re
 import random
 import logging
 import time
@@ -404,6 +405,11 @@ def is_201911(self):
         else:
             return True
 
+    def has_thermal_updater(self):
+        cmd = 'python3 -c "from sonic_platform import thermal_updater"'
+        out = self.dut.shell(cmd, module_ignore_errors=True)
+        return not out['failed']
+
 
 class FanDrawerData:
     """
@@ -807,6 +813,8 @@ def check_result(self, actual_data):
         """
         expected = {}
         for name, fields in list(self.expected_data.items()):
+            if self.excluded_entry_pattern and re.search(self.excluded_entry_pattern, name):
+                continue
             data = {}
             for idx, header in enumerate(self.expected_data_headers):
                 data[header] = fields[idx]
@@ -819,6 +827,8 @@ def check_result(self, actual_data):
         mismatch_in_actual_data = []
         for actual_data_item in actual_data:
             primary = actual_data_item[self.primary_field]
+            if self.excluded_entry_pattern and re.search(self.excluded_entry_pattern, primary):
+                continue
             if primary not in expected:
                 extra_in_actual_data.append(actual_data_item)
             else:
@@ -869,6 +879,7 @@ def __init__(self, dut):
             'drawer', 'led', 'fan', 'speed', 'direction', 'presence', 'status']
         self.primary_field = 'fan'
         self.excluded_fields = ['timestamp', ]
+        self.excluded_entry_pattern = None
 
     def deinit(self):
         """
@@ -1023,6 +1034,13 @@ def __init__(self, dut):
                                       'warning']
         self.primary_field = 'sensor'
         self.excluded_fields = ['timestamp', ]
+        if self.mock_helper.has_thermal_updater():
+            # if thermal updater is there, ASIC and module temperature are read from SDK sysfs.
+            # There is no way to mock SDK sysfs because it is created by kernel (user space has
+            # no permission to change it). So, we just ignore it for checking.
+            self.excluded_entry_pattern = re.compile(r"ASIC|(xSFP module \d+ Temp)")
+        else:
+            self.excluded_entry_pattern = None
 
     def deinit(self):
         """