Provisioning YML references unavailable Zookeeper version

[bkmu]

When attempting to establish a new Zookeeper cluster, Ansible encounters errors about being unable to download Zookeeper v3.4.6 thus failing to setup a functioning cluster.

Error output during node provisioning:

TASK: [Zookeeper | Ensure Zookeeper tar is downloaded] ************************ 
failed: [node-1] => {"dest": "/tmp", "failed": true, "gid": 0, "group": "root", "mode": "01777", "owner": "root", "response": "HTTP Error 404: Not Found", "size": 4096, "state": "directory", "status_code": 404, "uid": 0, "url": "http://apache.xl-mirror.nl/zookeeper/zookeeper-3.4.6/zookeeper-3.4.6.tar.gz"}
msg: Request failed

FATAL: all hosts have already failed -- aborting

Created PR #2 updating provisioning YML to the currently available version on the mirror in use.

[mkrcah]

Merged, thx!