Gian Merlino e6ec4310b1 IT: Switch to OpenJDK8 base image. (#5060)
* IT: Switch to OpenJDK8 base image.

Also split the Docker image into a base image and a child image, and
build the base image ahead of time for efficiency's sake. Also upgrade
ZK to 3.4.10.

* Additional comments about ZK upgrades.
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