Add hidden info for SonicWall

[s-fu]

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

Sensitive information also exists in the following lines. Mark then in hidden secret module.

• password xxx
• passphrase password xxx
• bind-password xxx
• authenticate sha1 xxx
• encryption aes xxx

[codecov-io]

Codecov Report

Merging #1938 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1938   +/-   ##
=======================================
  Coverage   63.32%   63.32%           
=======================================
  Files          30       30           
  Lines        1497     1497           
=======================================
  Hits          948      948           
  Misses        549      549

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