Zookeeper 3.4.8 has some improvements, specifically it handles DNS Re-resolution when a connection to zookeeper fails. This potentially allows Round Robin DNS without the need to hardcode the IP Addresses in the config.
ZkClient has a new 0.9 release which uses zookeeper 3.4.8 which is already marked as stable.
Tests are passing.
Here is the PR: https://github.com/apache/kafka/pull/1504