Add interface and update CLI to query current state to HAServiceProtocol
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Key: HADOOP-7925
URL: https://issues.apache.org/jira/browse/HADOOP-7925
Project: Hadoop Common
Issue Type: Sub-task
Affects Versions: HA Branch (HDFS-1623)
Reporter: Eli Collins
Assignee: Eli Collins
Common side of HDFS-2679.
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