Removed InModuleScope from xNetworkAdapter tests

[narrieta]

I was reviewing the comments in PowerShell/DscResources#175. @PlagueHO mentions issues trying to use the variables at the top of the script that hold the mock definitions.

Submitting one possible way to deal with those issues. My concern wrt InModuleScope is not as much about this particular test, but about using it in our test templates to write the entire test code.

@PlagueHO Let me know if you hit other issues with InModuleScope and I can look into them in the next few days.

Thanks

[PlagueHO]

@narrieta - that is some great work! This was extremely helpful. I very much appreciate your work on this.

When I get a chance I'll submit a PR to DSCResources to add this methodology to TestGuidelines.md.

Oh and

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Review status: 0 of 1 files reviewed at latest revision, all discussions resolved.

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[PlagueHO]

Reviewed 1 of 1 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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