Push the auto variable down into Guest.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>
Make sure all Ubuntu versions can find the preseed file.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>
Cleanup and clarify the kickstart injection code.

This splits out common functionality into
ozutil, and makes it easier to read.

Signed-off-by: Chris Lalancette <clalancette@gmail.com>