Add conf200 Zookeeper Service nodes in codfw.
We need to set up the new conf200 ZK service nodes in codfw,
to the hiera variables should be specified in DC specific config files.
This changes should be a no-op for the services currently using ZK
in eqiad, namely Hadoop and Kafka. The etcd role and config will be
added on a later stage.
The zookeeper_url hiera variable is also removed since not used anymore.