[Mellanox] Fan speed should not be 100% when PSU is powered off (#9258)

- Why I did it
When PSU is powered off, the PSU is still on the switch and the air flow is still the same. In this case, it is not necessary to set FAN speed to 100%.

- How I did it
When PSU is powered of, don't treat it as absent.

- How to verify it
Adjust existing unit test case
Add new case in sonic-mgmt

platform/mellanox/mlnx-platform-api/sonic_platform/thermal_infos.py

@@ -45,7 +45,7 @@ def collect(self, chassis):
                 elif status and fan in self._fault_fans:
                     self._fault_fans.remove(fan)
                     self._status_changed = True
-                    
+
 
     def get_absence_fans(self):
         """
@@ -96,12 +96,12 @@ def collect(self, chassis):
         """
         self._status_changed = False
         for psu in chassis.get_all_psus():
-            if psu.get_presence() and psu.get_powergood_status() and psu not in self._presence_psus:
+            if psu.get_presence() and psu not in self._presence_psus:
                 self._presence_psus.add(psu)
                 self._status_changed = True
                 if psu in self._absence_psus:
                     self._absence_psus.remove(psu)
-            elif (not psu.get_presence() or not psu.get_powergood_status()) and psu not in self._absence_psus:
+            elif (not psu.get_presence()) and psu not in self._absence_psus:
                 self._absence_psus.add(psu)
                 self._status_changed = True
                 if psu in self._presence_psus:

platform/mellanox/mlnx-platform-api/tests/test_thermal_policy.py

@@ -81,9 +81,9 @@ def test_psu_info():
 
     psu_list[0].powergood = False
     psu_info.collect(chassis)
-    assert len(psu_info.get_absence_psus()) == 1
-    assert len(psu_info.get_presence_psus()) == 0
-    assert psu_info.is_status_changed()
+    assert len(psu_info.get_absence_psus()) == 0
+    assert len(psu_info.get_presence_psus()) == 1
+    assert not psu_info.is_status_changed()
 
 
 def test_fan_policy(thermal_manager):
@@ -324,12 +324,12 @@ def test_load_control_thermal_algo_action():
     json_str = '{\"status\": \"false\"}'
     json_obj = json.loads(json_str)
     action.load_from_json(json_obj)
-    assert not action.status 
+    assert not action.status
 
     json_str = '{\"status\": \"true\"}'
     json_obj = json.loads(json_str)
     action.load_from_json(json_obj)
-    assert action.status 
+    assert action.status
 
     json_str = '{\"status\": \"invalid\"}'
     json_obj = json.loads(json_str)
@@ -428,7 +428,7 @@ class MockThermalManager(ThermalManagerBase):
 
     with pytest.raises(Exception):
         MockThermalManager.load(os.path.join(test_path, 'policy_with_same_conditions.json'))
-    
+
 def test_dynamic_minimum_table_data():
     from sonic_platform.device_data import DEVICE_DATA
     for platform, platform_data in DEVICE_DATA.items():
@@ -453,7 +453,7 @@ def check_minimum_table_data(platform, minimum_table):
         for item in data_list:
             cooling_level = item[0]
             range_str = item[1]
-            
+
             ranges = range_str.split(':')
             low = int(ranges[0])
             high = int(ranges[1])