sensor_info_record.py: Fix validation issues

Improve variable names and documentation, simplify threshold
validation logic, fix IPMI compliance checks, add explicit error
messages, and remove unused

sensor_info_record.py: Fix validation issues

Improve variable names and documentation, simplify threshold
validation logic, fix IPMI compliance checks, add explicit error
messages, and remove unused imports and variables and blank lines.

These changes resolve issues described in:
https://gerrit.openbmc.org/c/openbmc/openbmc-test-automation/+/54500

Change-Id: I3956f60406fe5e64566c2549364eb7d7e62f938a
Signed-off-by: Sayenath Ravi <sayenath.ravi@multicorewareinc.com>

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