Make sure EBS volume scans get asset.kind of "virtualmachine"

[tas50]

Describe the bug
We want users to be able to filter out virtual vs. bare metal systems using Kind filters in workspaces. In order to do this we need to make sure that EBS volume scans from the AWS integration are setting the asset.kind value to "virtualmachine" so we match Azure and Vagrant scans. Once this is done users can more easily build filter their assets.

Other things to think about

• Let's make sure there's no downstream impact in Atlas from this (Policies are already verified as being OK)
• If there are other scans we do of cloud VMs let's make sure to fix those as well

[tas50]

Paging @chris-rock to make sure there's no some unexpected downstream impact from this