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.

Conflicts:
	builder/vmware/driver.go
builder/vmware: We only need one runAndLog function

We shouldn't need a different one for each driver ...

Conflicts:
	builder/vmware/driver_workstation9.go
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