DellEMC: S6100, S6000 - Enable thermalctld, Platform API implementation and fixes

[ArunSaravananBalachandran]

- Why I did it

To incorporate the below changes in DellEMC S6100, S6000 platforms.

• S6100, S6000:
  • Enable 'thermalctld'
  • Implement DeviceBase methods (presence, status, model, serial) for Fantray and Component
  • Implement ‘get_position_in_parent’, ‘is_replaceable’ methods for all device types
  • Implement ‘get_status’ method for Fantray
  • Implement ‘get_temperature’, ‘get_temperature_high_threshold’, ‘get_voltage_high_threshold’, ‘get_voltage_low_threshold’ methods for PSU
  • Implement ‘get_status_led’, ‘set_status_led’ methods for Chassis
  • SFP:
    • Make EEPROM read both Python2 and Python3 compatible
    • Fix ‘get_tx_disable_channel’ method’s return type
    • Implement ‘tx_disable’, ‘tx_disable_channel’ and ‘set_power_override’ methods
• S6000:
  • Move PSU thermal sensors from Chassis to respective PSU
  • Make available the data of both Fans present in each Fantray

- How I did it

• Remove 'skip_thermalctld:true' in pmon_daemon_control.json
• Implement the platform API methods in the respective device files
• Use bytearray for data read from transceiver EEPROM
• Change return type of 'get_tx_disable_channel' to match specification in sonic_platform_common/sfp_base.py

- How to verify it

Verified that platform data is displayed by show platform fan and show platform temperature commands.
Wrote a python script to load Chassis class and then call the APIs accordingly.

UT Logs:
S6000_platform_API_UT_logs.txt
S6100_platform_API_UT_logs.txt

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

• 201811
• 201911
• 202006
• 202012

- Description for the changelog

DellEMC: S6100, S6000 - Enable thermalctld, Platform API implementation and fixes

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

[lgtm-com]

This pull request introduces 3 alerts and fixes 6 when merging daf0457 into 674fac2 - view on LGTM.com

new alerts:

• 3 for Wrong name for an argument in a class instantiation

fixed alerts:

• 3 for Wrong number of arguments in a class instantiation
• 2 for Except block handles 'BaseException'
• 1 for Wrong name for an argument in a class instantiation

[lgtm-com]

This pull request introduces 4 alerts and fixes 8 when merging 8b14d45 into 85a6314 - view on LGTM.com

new alerts:

• 4 for Wrong name for an argument in a class instantiation

fixed alerts:

• 4 for Wrong number of arguments in a class instantiation
• 2 for Except block handles 'BaseException'
• 1 for Wrong name for an argument in a class instantiation
• 1 for Result of integer division may be truncated