Add a flag to allow keeping bundles around (helps with CI)
Fix several problems in repo make targets
* quote DOCKER_EXPERIMENTAL variable
* pass-through arguments for gpg provided to dpkg-sig are now quoted
properly, so passphrases with shell-interpolated symbols can be used
* when determining deb suites, don't rely on 'origin' to be
github.com/docker/docker
Fix some issues with deb repository creation from scratch
* Don't add empty components to the repository configuration as they
will cause failure when generating.
Add old docker-engine-cs name to package conflicts
Signed-off-by: Mike Dougherty <mike.dougherty@docker.com>
