Don't add masterauth to inventory

[rabbitt]

Description of the changes

Treats masterauth like requirepass, obfuscating the password in the inventory list.

PR Review Checklist

Author

• add a risk label after carefully considering the "blast radius" of your changes
• describe the intent of your changes in the description. don't just rewrite your code in prose
• assign at least one reviewer

Reviewer

• review code for readability
• verify that high risk behavior changes are well tested
• check license for any new external dependency
• ask questions about anything that isn't clear and obvious
• approve the PR when you consider it's good to merge

[rabbitt]

This relates to #41

[mariomac]

Merging it into a feature branch to fix the format errors.