Improve integration test reliability - Fixes #329

[PlagueHO]

Pull Request (PR) description

• ComputerManagementDsc
  • Improved integration test reliability by resetting the DSC LCM before executing each test using the Reset-DscLcm function - Fixes Issue #329.
  • Split integration test MOF compilation out of application to standardize pattern and make it easier to determine cause of failure.

This Pull Request (PR) fixes the following issues

• Fixes #329

Task list

• [x] 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 in resource folder.
• [ ] Resource parameter descriptions added/updated in 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.
• [x] Integration tests added/updated (where possible). See DSC Resource Testing Guidelines.
• [x] New/changed code adheres to DSC Resource Style Guidelines and Best Practices.

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This change is 

[PlagueHO]

@johlju - would you mind reviewing this for me when you get time?

[johlju]

I hit the LGTM by mistake, but it just few extra line breaks that should be removed otherwise it looks good to me. 🙂