NAS-130771 / 24.10-RC.1 / Add RedactedFileMetric and use to redact iSCSI CHAP secrets (by bmeagherix)

[bugclerk]

Add RedactedFileMetric and use redact_chap_passwords callback to redact iSCSI CHAP secrets.

This will replace the secrets in the copy of /etc/scst.conf.

Original PR: #211
Jira URL: https://ixsystems.atlassian.net/browse/NAS-130771

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@                  Coverage Diff                  @@
##             stable/electriceel     #212   +/-   ##
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  Coverage                      ?   91.83%           
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  Files                         ?      103           
  Lines                         ?     2314           
  Branches                      ?        0           
=====================================================
  Hits                          ?     2125           
  Misses                        ?      189           
  Partials                      ?        0           

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[bugclerk]

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