CLOUDSTACK-4539: [VMWARE] vmware.create.full.clone is set to true in upgraded setup;default nature of vms are full clone
Description:

    Set the criterion for overriding/preserving the vmware.create.full.clone
    flag so that if past version deployments have any deployments (data centers),
    this flag will be set to false. Else, it will be set to true.
    The earlier criterion to set this flag was based on the CS version numbers,
    but that is not a good business logic to serve as a basis to set the flag.