CLOUDSTACK-5038:
used cpu is getting bumped up when the over provisioning factor > 1. This was because we didnt record the overprovisioning factors of the vms which got deployed pre 4.2
Upgrade path will fix that by populating the cpu/mem overprovisioning factors for each of the vms in user_vm_details table using the global overprovisioning factor.
Reviewed by : bharat kumar <bharat.kumar@citrix.com>
Signed off by : nitin mehta<nitin.mehta@citrix.com>