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Handle CloudError while iterating on VMs in AzVM

The `CloudError` exception may be raised while iterating on the virtual
machines iterator in this line of code:

    for vm_index, vm in enumerate(virtual_machines_iter):

An example of such an error is:

        msrestazure.azure_exceptions.CloudError: Azure Error:
        DisallowedOperation
        Message: The current subscription type is not permitted to
        perform operations on any provider namespace. Please use a
        different subscription.

This is currently correctly handled in `AzCloud` because `AzCloud`
iterates on each resource iterator inside a `try` block in its
`_get_record()` function. A similar approach is used in this fix to
resolve this issue.

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