Setup ZooKeeper security, controlled by authProvider.1 being set

To use this, set `node['zookeeper']['zoocfg']['authProvider.1']` to `org.apache.zookeeper.server.auth.SASLAuthenticationProvider` before calling `recipe[hadoop_wrapper::kerberos_init]` in your run_list.

Requires continuuity/hadoop_cookbook#74 to be completed