Add a delete_associated method to VirtualMachineService about azure-armrest HOT 7 CLOSED

@djberg96 - We need a way to ensure we delete these components for VMs provisioned through MIQ only.

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@bronaghs True, but that would be separate logic. With this method in place, we would be able to say "if we provisioned it through MIQ, then use this method."

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@djberg96 - agreed

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Actually, if all resources provisioned by CF are under the same resource group, we can just delete the resource group. For more details see http://www.codeisahighway.com/effective-ways-to-delete-resources-in-a-resource-group-on-azure/.

Having a method for those times when they aren't all under the same resource group would still be handy, though.

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@djberg96 - I dont think this will work for the following reasons:

1. Resources in a resource group share the same lifecycle, they are deployed, updated and deleted together. An application comprised of multiple tiers can belong to a resource group. This means if the resource group is deleted then all the servers in the application are deleted.
2. During provisioning in MIQ, resources (NSG, floating IP, VPC and Subnet) across all resource groups within the EMS region are available for selection, this means an instance can exist in a different resource group than its components.

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@bronaghs Alright, thanks for investigating. Will proceed with implementing the method.

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Added via #227

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