This PR only contains backports from master
Fix leak discovered on master, though 202012 is not affected it's better to have the fix (fixes [master] thermalctld leak on Arista devices makes them unreachable when memory is exhausted #7515)
Fix EepromDecoderimplementation in the platform API (fixes syseepromd crashing repeatedly on SONiC.20201231.02 #8263)
Fix Mineral platform definition and configuration
Fix build issues in environments where /proc is not mounted/restricted (fixes PLATFORM=broadcom fails arista "ReloadCauseManagerTest" first time #7800)
Fix some pytest issues
Add sfp-eeprom C API and also mount it in pmon