Fix tests, minor style issues, offline CAB update

[Borgquite]

Pull Request (PR) description

@johlju Have started work on this module with a lot of small ‘cleanup’ tasks.

Hopefully there’s no argument over these changes - gets the tests working, fixes some dodgy strings, updates the offline CAB, adds some additional Classification GUIDs to the notes for convenience. It should hopefully be a quick and easy one for review & approval :)

This Pull Request (PR) fixes the following issues

None

Task list

• Added an entry under the Unreleased section of the change log in the CHANGELOG.md.
  Entry should say what was changed, and how that affects users (if applicable).
• Resource documentation added/updated in README.md.
• Resource parameter descriptions added/updated in README.md, schema.mof
  and comment-based help.
• Comment-based help added/updated.
• Localization strings added/updated in all localization files as appropriate.
• Examples appropriately added/updated.
• Unit tests added/updated. See DSC Resource Testing Guidelines.
• Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[Borgquite]

@johlju Are you able to take a look at this sometime please?

[johlju]

When I have time I will take a look. 🙂