Update nagios_check_failing_nodes.rb

[sorano]

Fixes:
No such file or directory @ rb_sysopen - http://localhost:8888/nodes.json (Errno::ENOENT)

See discussion in: #67

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

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.42%. Comparing base (e740b60) to head (377dd34).
Report is 6 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3342      +/-   ##
==========================================
+ Coverage   70.39%   70.42%   +0.02%     
==========================================
  Files          77       77              
  Lines        3199     3202       +3     
==========================================
+ Hits         2252     2255       +3     
  Misses        947      947              

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