Ensure exceptions are derived from std::exception class
Ensure exceptions are derived from std::exception class

This is suggested by clang-tidy.

Change-Id: I8b1d0fb7c6c8e1e3f116bb477cac7f406dfee24c
Reviewed-by: Scott Parlane <85029adc3fa41ef14594a57826619713bfe95f25@alliedtelesis.co.nz>
Signed-off-by: Matt Bennett <e3d8681cec70d3da741935b3385821001b249adc@alliedtelesis.co.nz>

ATL-NZ/buildsyspp,alliedtelesis/buildsyspp