Refactorting DSC resources for preventing conflicts

[vrdmr]

This change is to fix the DSC resources such that they don't conflict with the newer versions of these resources.

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[AutorestCI]

Automation for azure-libraries-for-java

Nothing to generate for azure-libraries-for-java

[vrdmr]

Hi @fearthecowboy. Refactoring the DSC spec as we discussed to circumvent the DSC spec issue. Could you please review and merge this change. Thanks.

[AutorestCI]

Automation for azure-sdk-for-node

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-node#2483

[AutorestCI]

Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#1959

[AutorestCI]

Automation for azure-sdk-for-go

Nothing to generate for azure-sdk-for-go

[fearthecowboy]

Approved -- we're just moving the models out of the common definitions file and dropping them locally so the next api version can reference old files without getting the wrong models.