fixed vmware-vmx step order

The VMX needs to be cloned first, or StepConfigureVNC will fail on line 58.  I was hung up on checking out yamux, but this ended up being something simple I had figured out my fixed fork from shortly after pr/1169.  Either way, cheers!

solves at least:
https://gist.github.com/anonymous/d850e34b063501620b61 and https://github.com/mitchellh/packer/issues/1492