Set the grub timeout to 5 seconds by default, and add notes on how to
update this. This will stop infra having to carry an element that
goes and rewrites the grub configuration.
Change-Id: I556b3f48eff1b67ee8c4b9b64f749af95100fb99
In order to add more flexibility to the vm and bootloader
elements, split the functionality in two different ones, and
make vm depend on bootloader element.
This will allow to construct more elements that depend on
bootloader, and develop both elements independently.
Change-Id: Iad2503b7b8fe53b768a3bc79e4cb839700fbd747