[Mellanox] Enhance Python3 support for platform API (sonic-net#7410)

- Why I did it
Enhance the Python3 support for platform API. Originally, some platform APIs call SDK API which didn't support Python 3. Now the Python 3 APIs have been supported in SDK 4.4.3XXX, Python3 is completely supported by platform API

- How I did it
Start all platform daemons from python3
1. Remove #/usr/bin/env python at the beginning of each platform API file as the platform API won't be started as daemons but be imported from other daemons.
2. Adjust SDK API calls accordingly

- How to verify it
Manually test and run regression platform test

Signed-off-by: Stephen Sun <stephens@nvidia.com>

device/mellanox/x86_64-mlnx_msn2700-r0/pmon_daemon_control.json

@@ -1,7 +1,6 @@
 {
     "skip_ledd": true,
     "skip_fancontrol": true,
-    "delay_xcvrd": true,
-    "python2_daemons": ["xcvrd"]
+    "delay_xcvrd": true
 }
 

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #
@@ -1557,9 +1555,12 @@ def mgmt_phy_mod_pwr_attr_get(cls, power_attr_type, sdk_handle, sdk_index):
         sx_mgmt_phy_mod_pwr_attr = sx_mgmt_phy_mod_pwr_attr_t()
         sx_mgmt_phy_mod_pwr_attr.power_attr_type = power_attr_type
         sx_mgmt_phy_mod_pwr_attr_t_p_assign(sx_mgmt_phy_mod_pwr_attr_p, sx_mgmt_phy_mod_pwr_attr)
+        module_id_info = sx_mgmt_module_id_info_t()
+        module_id_info.slot_id = 0
+        module_id_info.module_id = sdk_index
         try:
-            rc = sx_mgmt_phy_mod_pwr_attr_get(sdk_handle, sdk_index, sx_mgmt_phy_mod_pwr_attr_p)
-            assert SX_STATUS_SUCCESS == rc, "sx_mgmt_phy_mod_pwr_attr_get failed"
+            rc = sx_mgmt_phy_module_pwr_attr_get(sdk_handle, module_id_info, sx_mgmt_phy_mod_pwr_attr_p)
+            assert SX_STATUS_SUCCESS == rc, "sx_mgmt_phy_module_pwr_attr_get failed {}".format(rc)
             sx_mgmt_phy_mod_pwr_attr = sx_mgmt_phy_mod_pwr_attr_t_p_value(sx_mgmt_phy_mod_pwr_attr_p)
             pwr_mode_attr = sx_mgmt_phy_mod_pwr_attr.pwr_mode_attr
             return pwr_mode_attr.admin_pwr_mode_e, pwr_mode_attr.oper_pwr_mode_e
@@ -1581,7 +1582,7 @@ def get_lpmode(self):
             get_lpmode_code = 'from sonic_platform import sfp;\n' \
                               'with sfp.SdkHandleContext() as sdk_handle:' \
                               'print(sfp.SFP._get_lpmode(sdk_handle, {}))'.format(self.sdk_index)
-            lpm_cmd = "docker exec pmon python -c \"{}\"".format(get_lpmode_code)
+            lpm_cmd = "docker exec pmon python3 -c \"{}\"".format(get_lpmode_code)
             try:
                 output = subprocess.check_output(lpm_cmd, shell=True, universal_newlines=True)
                 return 'True' in output
@@ -1985,7 +1986,7 @@ def reset(self):
                          'with sfp.SdkHandleContext() as sdk_handle:' \
                          'print(sfp.SFP._reset(sdk_handle, {}))' \
                          .format(self.sdk_index)
-            reset_cmd = "docker exec pmon python -c \"{}\"".format(reset_code)
+            reset_cmd = "docker exec pmon python3 -c \"{}\"".format(reset_code)
 
             try:
                 output = subprocess.check_output(reset_cmd, shell=True, universal_newlines=True)
@@ -1999,9 +2000,12 @@ def reset(self):
 
     @classmethod
     def _reset(cls, sdk_handle, sdk_index):
-        rc = sx_mgmt_phy_mod_reset(sdk_handle, sdk_index)
+        module_id_info = sx_mgmt_module_id_info_t()
+        module_id_info.slot_id = 0
+        module_id_info.module_id = sdk_index
+        rc = sx_mgmt_phy_module_reset(sdk_handle, module_id_info)
         if rc != SX_STATUS_SUCCESS:
-            logger.log_warning("sx_mgmt_phy_mod_reset failed, rc = %d" % rc)
+            logger.log_error("Error occurred when resetting SFP module {}, error code {}".format(sdk_index, rc))
 
         return rc == SX_STATUS_SUCCESS
 
@@ -2115,10 +2119,13 @@ def mgmt_phy_mod_pwr_attr_set(cls, sdk_handle, sdk_index, power_attr_type, admin
         sx_mgmt_phy_mod_pwr_attr.pwr_mode_attr = sx_mgmt_phy_mod_pwr_mode_attr
         sx_mgmt_phy_mod_pwr_attr_p = new_sx_mgmt_phy_mod_pwr_attr_t_p()
         sx_mgmt_phy_mod_pwr_attr_t_p_assign(sx_mgmt_phy_mod_pwr_attr_p, sx_mgmt_phy_mod_pwr_attr)
+        module_id_info = sx_mgmt_module_id_info_t()
+        module_id_info.slot_id = 0
+        module_id_info.module_id = sdk_index
         try:
-            rc = sx_mgmt_phy_mod_pwr_attr_set(sdk_handle, SX_ACCESS_CMD_SET, sdk_index, sx_mgmt_phy_mod_pwr_attr_p)
+            rc = sx_mgmt_phy_module_pwr_attr_set(sdk_handle, SX_ACCESS_CMD_SET, module_id_info, sx_mgmt_phy_mod_pwr_attr_p)
             if SX_STATUS_SUCCESS != rc:
-                logger.log_error("sx_mgmt_phy_mod_pwr_attr_set failed, rc = %d" % rc)
+                logger.log_error("Error occurred when setting power mode for SFP module {}, error code {}".format(sdk_index, rc))
                 result = False
             else:
                 result = True
@@ -2168,7 +2175,7 @@ def set_lpmode(self, lpmode):
                               'with sfp.SdkHandleContext() as sdk_handle:' \
                               'print(sfp.SFP._set_lpmode({}, sdk_handle, {}))' \
                               .format('True' if lpmode else 'False', self.sdk_index)
-            lpm_cmd = "docker exec pmon python -c \"{}\"".format(set_lpmode_code)
+            lpm_cmd = "docker exec pmon python3 -c \"{}\"".format(set_lpmode_code)
 
             # Set LPM
             try:

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

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 '''
 listen to the SDK for the SFP change event and return to chassis.
 '''

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 #############################################################################
 # Mellanox
 #

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

@@ -1,5 +1,3 @@
-#!/usr/bin/env python
-
 """
 Mellanox