Set ec2_instance_missing_max_count default to 0, to match behavior before the option was added.

[dreambeyondorange]

Tests

• Ran unit tests and integration test for test_slurm_protected_mode locally to ensure success

References

• Link to impacted open issues.
• Link to related PRs in other packages (i.e. cookbook, node).
• Link to documentation useful to understand the changes.

Checklist

• Make sure you are pointing to the right branch.
• If you're creating a patch for a branch other than develop add the branch name as prefix in the PR title (e.g. [release-3.6]).
• Check all commits' messages are clear, describing what and why vs how.
• Make sure to have added unit tests or integration tests to cover the new/modified code.
• Check if documentation is impacted by this change.

Please review the guidelines for contributing and Pull Request Instructions.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.77%. Comparing base (29e65f6) to head (86e7920).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #617   +/-   ##
========================================
  Coverage    90.77%   90.77%           
========================================
  Files           20       20           
  Lines         3123     3123           
========================================
  Hits          2835     2835           
  Misses         288      288           

Flag	Coverage Δ
unittests	90.77% <ø> (ø)

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