Missing ZooKeeper data log retention configuration and Pinot controller segment deletion retention configuration

[iamdorsa]

I have encountered two issues while deploying the Pinot cluster using the ansible playbook available in this repository.

Firstly, I noticed that the ZooKeeper configuration file does not have the data log retention configuration set. This is important because without a retention policy, the ZooKeeper data logs can consume a large amount of disk space over time. It is recommended to configure the data log retention to limit the disk usage of ZooKeeper data logs.

Secondly, I observed that the Pinot controller does not have a configuration for segment deletion retention. This means that the deleted segments are not removed from the disk, and they can accumulate over time, leading to disk space issues. It is recommended to configure a retention policy for deleted segments to ensure that they are removed from the disk after a certain period.

[iamdorsa]

This PR fixes it. #3