New files for baremetal driver:
- lib/baremetal
- files/apts/baremetal
Adds two dependencies:
- google shell-in-a-box
- diskimage-builder
Enable by setting both:
VIRT_DRIVER=baremetal
ENABLED_SERVICES="$ENABLED_SERVICES,baremetal"
Change-Id: Ibf6fe1671a759a449c9eb0df47751d1b31ade591