builder/vmware: We only need one runAndLog function

We shouldn't need a different one for each driver ...
builder/vmware: Add Support for VMware Player 5 (Linux)

We have two choices for VMware on Linux.  We already support
Workstation, add support for Player too.

VMware Player doesn't come with vmware-vdiskmanager, so fall back to
using qemu-img if we can find that.