Adds new resource DismFeature

[johlju]

Pull Request (PR) description

• ComputerManagementDsc
  • Added new resource DismFeature.

Deprecates the xDismFeature resource in the module xDismFeature. Suggest doing this instead of maintain a single resource module.

This Pull Request (PR) fixes the following issues

Partly issue PowerShell/DscResources#374

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 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.
• 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 

[johlju]

@PlagueHO let’s wait with this one as it seems this is no longer necessary. If there haven’t been any reported scenarios by this upcoming weekend where this resource is necessary then I close this and just deprecate the xDismFeature repo. If there are scenarios for this in the future I will be keeping the working branch.

[PlagueHO]

@johlju - you might be right. What was the difference between using DISM and *-WindowsFeature? It seems like they cover the same area....

[johlju]

I’m not sure as I never have used DISM to install anything as far as I can remember. I sent a tweet and asked in #DSC channel but haven’t yet seen a scenario where it is needed.
Maybe this pre-WindowsFeature (older OS:es that is no longer supported)

[PlagueHO]

Cool. Maybe a resource we could drop. I suspect it was for Windows Server 2008 R2 that didn't have the *-WindowsFeature cmdlets....

[johlju]

Closing this PR. There has not been any reported workloads that need this resource. If a resource for DISM is ever needed then I will keep the working branch, and the code will still exist in the closed PR for reference.