This reverts commit 4a762a6a8a.
A partial revert of 13cfceaea4 is also
performed to swap out zookeeper-statsd without affecting other images.
We perform this revert because Docker cannot do speculative gating of
images hosted anywhere but on docker.io. Speculative testing of
container images is an important feature that we wish to keep so revert
until we can stop relying on Docker.
Change-Id: I7ceafdb7cf1dfd4812ea8f12f273f01045ca89a2