[#62905634] Fix Vm unit tests to use @vm_id
[#62905634] Fix Vm unit tests to use @vm_id

... rather than supplying a full vcloud_attributes hash

NB: One test still failing, think due to a masked bug surfacing

UKHomeOffice/vcloud-launcher,gds-operations/vcloud-launcher,gds-operations/vcloud-launcher,gds-operations/vcloud-launcher,UKHomeOffice/vcloud-launcher,UKHomeOffice/vcloud-launcher