Making PDDF 2.0 base classes python3 compliant

[FuzailBrcm]

Why I did it

We need to make the PDDF 2.0 base API implementation python3 compliant

How I did it

• Made python2 to python3 changes
• Removed ord() func as python3 return int instead of str
• Had to change chr(..) to bytes([..]) function while using ctypes class methods

How to verify it

Verified it with a sample AS9716 (TH3) platform which is being using PDDF as in PR (#6902).
Without these changes we were not able to load the PAI 2.0 and getting the following errors.

>>> from sonic_platform.platform import Platform
>>> ch = Platform().get_chassis()
>>> ch.get_sfp(16).get_transceiver_info()
Error: Unable to open eeprom_path: ord() expected string of length 1, but int found
Error: Unable to open eeprom_path: ord() expected string of length 1, but int found
Error: Unable to open eeprom_path: ord() expected string of length 1, but int found
Error: Unable to open eeprom_path: ord() expected string of length 1, but int found
Error: Unable to open eeprom_path: ord() expected string of length 1, but int found
Error: Unable to open eeprom_path: ord() expected string of length 1, but int found
Error: Unable to open eeprom_path: ord() expected string of length 1, but int found
{'type': 'Unknown', 'hardware_rev': 'Non-hexadecimal digit found', 'serial': 'Non-hexadecimal digit found', 'manufacturer': 'Non-hexadecimal digit found', 'model': 'Non-hexadecimal digit found', 'connector': 'Unknown', 'encoding': 'Unknown', 'ext_identifier': 'Unknown', 'ext_rateselect_compliance': 'Unknown', 'cable_type': 'Length Cable Assembly(m)', 'cable_length': '0', 'nominal_bit_rate': '0', 'specification_compliance': '{}', 'vendor_date': '20No-n--he xa', 'vendor_oui': '0x00-0x00-0x00', 'application_advertisement': 'N/A', 'type_abbrv_name': 'Unknown'}
>>>

After the fix,

>>> ch.get_sfp(16).get_transceiver_info()
{'type': 'QSFP+ or later', 'hardware_rev': 'A', 'serial': 'ES8077F', 'manufacturer': 'FINISAR CORP', 'model': 'FTL410QE2C', 'connector': 'MPOx12', 'encoding': '64B66B', 'ext_identifier': 'Power Class 1(1.5W max), CLEI present', 'ext_rateselect_compliance': 'QSFP+ Rate Select Version 1', 'cable_type': 'Length Cable Assembly(m)', 'cable_length': '0', 'nominal_bit_rate': '103', 'specification_compliance': "{'10/40G Ethernet Compliance Code': '40GBASE-SR4', 'Fibre Channel link length/Transmitter Technology': 'Short distance (S)', 'Fibre Channel transmission media': 'Shielded Twisted Pair (TP)'}", 'vendor_date': '2014-09-02 ', 'vendor_oui': '00-90-65', 'application_advertisement': 'N/A', 'type_abbrv_name': 'QSFP+'}
>>>
>>>
root@sonic:/home/admin# decode-syseeprom
TlvInfo Header:
   Id String:    TlvInfo
   Version:      1
   Total Length: 169
TLV Name             Code Len Value
-------------------- ---- --- -----
Manufacture Date     0x25  19 04/29/2019 16:38:12
Label Revision       0x27   4 R0BA
Platform Name        0x28  27 x86_64-accton_as9716_32D-r0
ONIE Version         0x29  13 2018.08.00.03
Manufacturer         0x2B   6 Accton
Manufacture Country  0x2C   2 TW
Diag Version         0x2E   8 0.2.0.14
Base MAC Address     0x24   6 80:A2:35:5A:12:50
Serial Number        0x23  14 971632D1913010
Part Number          0x22  13 FP5ZZ8632006A
Product Name         0x21  15 9716-32D-O-AC-F
MAC Addresses        0x2A   2 256
Vendor Name          0x2D   8 Edgecore
CRC-32               0xFE   4 0x4E80417A
(checksum valid)
root@sonic:/home/admin#
root@sonic:/home/admin# pddf_psuutil mfrinfo
PSU1 is Not OK

PSU2 is OK
Manufacture Id: 3Y POWER
Model: YESM1300AM
Serial Number: S0A000X601825000090
Fan Direction: Intake

root@sonic:/home/admin# pddf_psuutil seninfo
PSU1 is Not OK

PSU2 is OK
Output Voltage: 12041.0 mv
Output Current: 19906.0 ma
Output Power: 238000.0 mw
Fan1 Speed: 13600 rpm

root@sonic:/home/admin# pddf_fanutil getspeed
FAN           SPEED (RPM)
----------  -------------
Fantray1_1           5800
Fantray1_2           6000
Fantray2_1           5800
Fantray2_2           5900
Fantray3_1           5700
Fantray3_2           5800
Fantray4_1           5700
Fantray4_2           5800
Fantray5_1           5900
Fantray5_2           5900
Fantray6_1           5800
Fantray6_2           5900
root@sonic:/home/admin# pddf_thermalutil gettemp
Temp Sensor    Label           Value
-------------  --------------  -------------------------------
Temp_1         lm75-i2c-49-48  temp1	 +27.0 C (high = +80.0 C)
Temp_2         lm75-i2c-49-49  temp1	 +29.5 C (high = +80.0 C)
Temp_3         lm75-i2c-49-4a  temp1	 +27.5 C (high = +80.0 C)
Temp_4         lm75-i2c-49-4b  temp1	 +26.5 C (high = +80.0 C)
Temp_5         lm75-i2c-49-4c  temp1	 +30.5 C (high = +80.0 C)
Temp_6         lm75-i2c-49-4e  temp1	 +27.0 C (high = +80.0 C)
Temp_7         lm75-i2c-49-4f  temp1	 +30.5 C (high = +80.0 C)
root@sonic:/home/admin#
root@sonic:/home/admin#

Which release branch to backport (provide reason below if selected)

• 201811
• 201911
• 202006
• 202012

Description for the changelog

Related to the PR (#6902)

A picture of a cute animal (not mandatory but encouraged)

[ben-gale]

@lguohan and review team - please look at this at the earliest - we are working with Accton on a platform contribution that has a dependency upon this PR - thanks.

[ben-gale]

Thanks Joe!