Default data_log_dir doesn't match documentation

[neuromantik33]

Hi in the README for the scripts it is stated that:

--data_log_dir      The directory where the ZooKeeper process will store its 
                    write ahead log. The default is 
                    /var/lib/zookeeper/data/log. This directory must be 
                    backed by a persistent volume.

However at line 82 of start-zookeeper it is

DATA_LOG_DIR="/var/lib/zookeeper/log"

I'm trying to use defaults as much as possible and avoid having unecessarily verbose commands in my manifest.