Update Zookeeper client and other minor maintenance #183
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The primary goal of this PR is to upgrade the Zookeeper client package. The old one, github.com/samuel/go-zookeeper, is no longer being maintained. All development on it has shifted to github.com/go-zookeeper/zk.
To make that change, the code needed a touch-up:
Additionally, this updates the module to use go1.16 conventions, since that is the earliest supported Go version. This isn't strictly needed; it's just keeping the build up-to-date for security patches.