**- 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
- Skip thermalctld in DellEMC S6000, S6100, Z9100 and Z9264 platforms.
- Change the return type of thermal Platform APIs in DellEMC S6000, S6100, Z9100 and Z9264 platforms to 'float'.
