Adding new dsc extension status cmdlet

[vors]

Changes for the new cmdlet - Get-AzureVMDSCExtensionStatus that gets the DSC Extension status for all the vm's deployed in a cloud service or for a particular vm in the service.

[azurecla]

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[markcowl]

No longer CloudException

[markcowl]

@vors Need to update the new cmdlet for the changes in the latest common library (for example CloudException -> HttpOperationException)

[azurecla]

@vors, Thanks for signing the contribution license agreement so quickly! Actual humans will now validate the agreement and then evaluate the PR.

Thanks, AZPRBOT;

[stankovski]

@vors - we are planning to discontinue mstest runner in the near future. Please update your tests to use XUnit

[stankovski]

Wrap long lines for readability

[matt-gibbs]

440+ characters on a line is excessive. Split appropriately.