For the CS Engine we need to have an install script like OSS does, but
the locations are all different, as is the GPG key used. This is
accomplished here by slightly altering the script itself and adding a
simple 'sed' based bundle for make.sh.
This install script is used in to change the URLs instead of sed in
release.sh.
Signed-off-by: Mike Dougherty <mike.dougherty@docker.com>
