builder/vmware: Add support for Workstation 9 (Linux).

Now the VMware builder should automatically pick between Fusion 5 and
Workstation 9, based on which one is installed.
builder/vmware: split drivers out into individual files
builder/vmware: wording
Update CHANGELOG
scripts: Use XC_ARCH/XC_OS to limit what arch/os combo is built
builder/vmware: workstation 9 show stderr if command fails
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.