Reverts the switch to open-vm-tools.
Reverts the switch to open-vm-tools.

open-vm-tools doesn't include the HGFS driver as part of it's current
configuration, which is needed for Vagrant.

However, the installer behaviour has changed to silently terminate if the
platform has open-vm-tools available, so here we're forcing the install.

nickcharlton/boxes,nickcharlton/boxes,nickcharlton/boxes