Add support for Fibrestore FSOS

[tcrichton]

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

Added model Fibrestore FSOS

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (2a6d2ff) 66.03% compared to head (c666131) 66.03%.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3069   +/-   ##
=======================================
  Coverage   66.03%   66.03%           
=======================================
  Files          30       30           
  Lines        1531     1531           
=======================================
  Hits         1011     1011           
  Misses        520      520           

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