disable setup

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
Update Gemfiles

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
add packer template generation

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>
add 'rake packer:* tasks'

Signed-off-by: Sebastien Varrette <sebastien.varrette@uni.lu>