Retrieve the CID value for VMDK(s) for a given virtual machine.

Sample Execution:

[vi-admin@rafaeli ~]$ ./getVMDiskCID.pl --server mauna-loa.primp-industries.com --username primp --vmname lamw_base
Enter password:
Virtual Machine: lamw_base
        CURRENT VMDK: [everest-local-storage] lamw_base/lamw_base-000002.vmdk
        CID: 0xb95ddf5b
        PARENT VMDK: [everest-local-storage] lamw_base/lamw_base-000001.vmdk
        CID: 0xb95ddf5b
        PARENT VMDK: [everest-local-storage] lamw_base/lamw_base.vmdk
        CID: 0xb95ddf5b