Prevent ResourceHelper and Common cmdlets from being exported - Fixes #213

[PlagueHO]

This resolves a high priority issue with newer versions of xNetworking, xCertificate, xStorage and xDFS conflicting with each other because the ResourceHelper cmdlets are being exported due to the way each resource imported them (using the PSD1 nested modules array).

This should be resolved in xCertificate, xStorage and xDFS as well to ensure no other conflicts.

This also contains a new integration test that will check for any further conflicts between resource modules. At some point it might be possible to move this test into the DSCResource.Tests common tests to provide more comprehensive conflict prevention. However, because the conflicts will potentially be between three different modules the number of modules compared will have to go in over time.

This fixes #213

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This change is 

[codecov-io]

Codecov Report

Merging #214 into dev will increase coverage by <1%.
The diff coverage is 100%.

@@         Coverage Diff          @@
##            dev   #214    +/-   ##
====================================
+ Coverage    96%    96%   +<1%     
====================================
  Files        17     17            
  Lines      1222   1273    +51     
====================================
+ Hits       1174   1225    +51     
  Misses       48     48

[johlju]

Reviewed 20 of 20 files at r1.
Review status: all files reviewed at latest revision, 1 unresolved discussion.

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Tests/Integration/ModuleConflict.Tests.ps1, line 37 at r1 (raw file):

                {
                    Install-Module -Name $moduleToTest -ErrorAction Stop
                } | Should not throw

Same comment as in xStorage

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Comments from Reviewable

[PlagueHO]

This too could use a global search replace to correct the style, but I'll do this in a separate issue.

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Review status: 19 of 20 files reviewed at latest revision, 1 unresolved discussion.

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Tests/Integration/ModuleConflict.Tests.ps1, line 37 at r1 (raw file):

Previously, johlju (Johan Ljunggren) wrote…

Same comment as in xStorage

Done.

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Comments from Reviewable

[johlju]

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Reviewed 1 of 1 files at r2.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable

[PlagueHO]

Thanks again so much for your help @johlju