A possible Zookeeper R-Spec Test

Runs through with `bundle exec rspec` producing:
````
kafka::zookeeper
  when node[:kafka][:install_method] equals :source
    behaves like a valid install method
      includes kafka::_setup
      includes kafka::install_method recipe
    behaves like a valid zookeeper setup
      creates a configuration file for Zookeeper
      creates a directory for Zookeeper logs
      creates a configuration file for Zookeeper log4j
      creates a sysconfig file
      creates an init.d script for Zookeeper
      enables a 'zookeeper' service
      starts a 'zookeeper' service
  when node[:kafka][:install_method] equals :binary
    behaves like a valid install method
      includes kafka::_setup
      includes kafka::install_method recipe
    behaves like a valid zookeeper setup
      creates a configuration file for Zookeeper
      creates a directory for Zookeeper logs
      creates a configuration file for Zookeeper log4j
      creates a sysconfig file
      creates an init.d script for Zookeeper
      enables a 'zookeeper' service
      starts a 'zookeeper' service

````