Remove references to i0tec.zkClient and replace with Curator

We've had some issues with ZooKeeper state changes after ZK quorum issues.  Our current zookeeper client is an unsupported library that was just thrown out there, we should switch over to Curator instead.

This will get us on a supported code base and also give us access to their body of knowledge when we do run into issues.

This pull request is the full switch over.