[pddf]: Update PDDF utils and common platform APIs for Debian Bullseye (

sonic-net#9585)

- Why I did it
PDDF utils were python2 compliant and they needed to be migrated to Python3 (as per Bullseye)
PDDF common platform APIs file name changed as the name was already in use
Indentation issues
Dead/redundant code needed to be removed

- How I did it
Made files Python3 compliant
Indentation corrected
Redundant code removed

- How to verify it
AS7326 Accton platform uses PDDF. PDDF utils were run on this platform to verify.

platform/pddf/i2c/utils/pddf_util.py

@@ -15,7 +15,6 @@
     switch-nonpddf  : switch to per platform, non-pddf mode
 """
 
-import commands
 import logging
 import getopt
 import os
@@ -120,7 +119,7 @@ def my_log(txt):
 
 def log_os_system(cmd, show):
     logging.info('Run :'+cmd)  
-    status, output = commands.getstatusoutput(cmd)    
+    status, output = subprocess.getstatusoutput(cmd)
     my_log (cmd +"with result:" + str(status))
     my_log ("      output:"+output)    
     if status:
@@ -138,33 +137,9 @@ def driver_check():
         return False   
     return True
 
-
-# Returns platform and HW SKU
-def get_platform_and_hwsku():
-    try:
-        proc = subprocess.Popen([SONIC_CFGGEN_PATH, '-H', '-v', PLATFORM_KEY],
-                                stdout=subprocess.PIPE,
-                                shell=False,
-                                stderr=subprocess.STDOUT)
-        stdout = proc.communicate()[0]
-        proc.wait()
-        platform = stdout.rstrip('\n')
-
-        proc = subprocess.Popen([SONIC_CFGGEN_PATH, '-d', '-v', HWSKU_KEY],
-                                stdout=subprocess.PIPE,
-                                shell=False,
-                                stderr=subprocess.STDOUT)
-        stdout = proc.communicate()[0]
-        proc.wait()
-        hwsku = stdout.rstrip('\n')
-    except OSError, e:
-        raise OSError("Cannot detect platform")
-
-    return (platform, hwsku)
-
 def get_path_to_device():
     # Get platform and hwsku
-    (platform, hwsku) = get_platform_and_hwsku()
+    (platform, hwsku) = pddf_obj.get_platform_and_hwsku()
 
     # Load platform module from source
     platform_path = "/".join([PLATFORM_ROOT_PATH, platform])
@@ -193,14 +168,20 @@ def config_pddf_utils():
                     log_os_system('mv '+SONIC_PLATFORM_BSP_WHL_PKG+' '+SONIC_PLATFORM_BSP_WHL_PKG_BK, 1)
             # PDDF whl package exist ... this must be the whl package created from 
             # PDDF 2.0 ref API classes and some changes on top of it ... install it
+            log_os_system('sync', 1)
             shutil.copy(SONIC_PLATFORM_PDDF_WHL_PKG, SONIC_PLATFORM_BSP_WHL_PKG)
+            log_os_system('sync', 1)
             print("Attemting to install the PDDF sonic_platform wheel package ...")
-            status, output = log_os_system("pip3 install "+ SONIC_PLATFORM_BSP_WHL_PKG, 1)
-            if status:
-                print("Error: Failed to install {}".format(SONIC_PLATFORM_BSP_WHL_PKG))
-                return status
+            if os.path.getsize(SONIC_PLATFORM_BSP_WHL_PKG) != 0:
+                status, output = log_os_system("pip3 install "+ SONIC_PLATFORM_BSP_WHL_PKG, 1)
+                if status:
+                    print("Error: Failed to install {}".format(SONIC_PLATFORM_BSP_WHL_PKG))
+                    return status
+                else:
+                    print("Successfully installed {} package".format(SONIC_PLATFORM_BSP_WHL_PKG))
             else:
-                print("Successfully installed {} package".format(SONIC_PLATFORM_BSP_WHL_PKG))
+                print("Error: Failed to copy {} properly. Exiting ...".format(SONIC_PLATFORM_PDDF_WHL_PKG))
+                return -1
         else:
             # PDDF with platform APIs 1.5 must be supported
             device_plugin_path = "/".join([device_path, "plugins"])
@@ -228,13 +209,17 @@ def config_pddf_utils():
                 if status:
                     print("Error: Unable to uninstall BSP sonic-platform whl package")
                     return status
-                print("Attemting to install the PDDF sonic_platform wheel package ...")
-                status, output = log_os_system("pip3 install "+ SONIC_PLATFORM_BSP_WHL_PKG, 1)
-                if status:
-                    print("Error: Failed to install {}".format(SONIC_PLATFORM_BSP_WHL_PKG))
-                    return status
+                print("Attempting to install the PDDF sonic_platform wheel package ...")
+                if os.path.getsize(SONIC_PLATFORM_BSP_WHL_PKG) != 0:
+                    status, output = log_os_system("pip3 install "+ SONIC_PLATFORM_BSP_WHL_PKG, 1)
+                    if status:
+                        print("Error: Failed to install {}".format(SONIC_PLATFORM_BSP_WHL_PKG))
+                        return status
+                    else:
+                        print("Successfully installed {} package".format(SONIC_PLATFORM_BSP_WHL_PKG))
                 else:
-                    print("Successfully installed {} package".format(SONIC_PLATFORM_BSP_WHL_PKG))
+                    print("Error: Failed to copy {} properly. Exiting ...".format(SONIC_PLATFORM_PDDF_WHL_PKG))
+                    return -1
             else:
                 # system rebooted in pddf mode 
                 print("System rebooted in PDDF mode, hence keeping the PDDF 2.0 classes")
@@ -353,6 +338,16 @@ def driver_install():
         if status:
             print("Error: pddf_pre_driver_install script failed with error %d"%status)
             return status
+        # For debug
+        print(output)
+
+    # Removes the perm_kos first, then reload them in a proper sequence
+    for mod in perm_kos:
+        cmd = "modprobe -rq " + mod
+        status, output = log_os_system(cmd, 1)
+        if status:
+            print("driver_install: Unable to unload {}".format(mod))
+            # Don't exit but continue
 
     log_os_system("depmod", 1)
     for i in range(0,len(kos)):