updated step_clone_vmx.go to work with vmx files using sata

Reference issues 1242, 1595

Problem:  When using the vmware vmx builder, it fails if the vmx is using sata rather than scsi.

I tested with VMware 7.0 Professional.  I used both a vmx with scsi and one with sata, with success. 

Please forgive the code if it is terrible.  This is my first attempt with go and I referenced a few stack exchange sites to get what I needed.