Zookeeper instance resource management

[dazza-codes]

Zookeeper instances could be improved with these additions:

• assign IP addresses to each node and retain their network interfaces whenever the instance is terminated and replaced.
• retain the instance volume whenever it is terminated, so the zookeeper data nodes are retained even when the instance is replaced and added back into the quorum.
• add an additional data disk, the zoo.cfg says:

    # Place the dataLogDir to a separate physical disc for better performance
    # dataLogDir=/disk2/zookeeper