xWebVirtualDirectory: Fails to create directory under application

[omiossec]

As a proposed solution to the #331 issue I propose to change the way the resource checks Virtual Directory.

This Pull Request (PR) fixes the following issues

• Fixes #331

Task list

• [ x] Added an entry to the change log under the Unreleased section of the CHANGELOG.md. Entry should say what was changed and how that affects users (if applicable), and reference the issue being resolved (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 

[johlju]

@regedit32 Do you have time to look over this too? You have a better knowledge around these cmdlets than me. 😄

[regedit32]

@johlju solution looks good, but I will take another look after tests have been added.

[johlju]

We have renamed the resource, removing 'x', so please rebase this PR.