New kubernetes-entrypoint version was released. K8s-entrypoint
authors maintain images at Quay. The image uses CoreOS, which
is more lightweight than the current Ubuntu image, so it
should lessen the burden on the infrastructure.
Change-Id: Id8c2a4d065550ffbd64476377247cccf213b58e1
Partial-Implements: blueprint entrypoint-namespaces
1fe3ca34c9