[Issue: 1070] Remove upper case from serial number

[katarzyna-kulpa]

Purpose

Resolves #1070

Do not alter serial disk number

PR checklist

• Add link to the issue
• Choose Project
• Choose PR label
• New unit tests added
• Modified code has meaningful comments
• All TODOs are linked with the issues
• All comments are resolved

Testing

All regression tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7884f9a) 72.76% compared to head (4d788b0) 72.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1075   +/-   ##
=======================================
  Coverage   72.76%   72.76%           
=======================================
  Files          63       63           
  Lines        8949     8949           
=======================================
  Hits         6512     6512           
  Misses       2147     2147           
  Partials      290      290           

Flag	Coverage Δ
unittests	72.76% <ø> (ø)

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