Change C4CMTS to use EEPROM data for inventory information

[nickhilliard]

Pre-Request Checklist

• [ ] Passes rubocop code analysis (try rubocop --auto-correct)
• [ ] Tests added or adapted (try rake test)
• [ ] Changes are reflected in the documentation
• [ ] User-visible changes appended to CHANGELOG.md

Description

"show inventory" on this platform shows transit information which can change on each login. "show factory-eeprom" shows only persistent data based on the chassis inventory, so is more suitable for oxidized output.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 66.02%. Comparing base (30ada6b) to head (762d031).

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3061   +/-   ##
=======================================
  Coverage   66.02%   66.02%           
=======================================
  Files          33       33           
  Lines        1613     1613           
=======================================
  Hits         1065     1065           
  Misses        548      548           

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[robertcheramy]

Thank you @nickhilliard for this PR. Please document the change in CHANGELOG.md.