Add ZK client for leader election
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Key: HDFS-2681
URL: https://issues.apache.org/jira/browse/HDFS-2681
Project: Hadoop HDFS
Issue Type: Sub-task
Affects Versions: HA branch (HDFS-1623)
Reporter: Suresh Srinivas
Assignee: Suresh Srinivas
ZKClient needs to support the following capabilities:
# Ability to create a znode for co-ordinating leader election.
# Ability to monitor and receive call backs when active znode status changes.
# Ability to get information about the active node.
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