Fixed Issues in Zookeeper

Review the list of ZooKeeper issues that are resolved in Cloudera Runtime 7.1.9.

OPSAPS-67223: ZDU | CDH 717sp2 to 719 AND 718 to 719 | Zookeeper is going in bad health and blocking the upgrade

Convert the avgRequestLatency metric to double for backward compatibility with Zookeeper versions before 3.8.