Add idle state for Agent heartbeat
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Key: AMBARI-17
URL: https://issues.apache.org/jira/browse/AMBARI-17
Project: Ambari
Issue Type: Improvement
Affects Versions: 0.1.0
Environment: Java 6
Reporter: Eric Yang
Fix For: 0.1.0
For controller to identify if there is any action pending for agent to execute.
It would be nice to show idle state in the agent to controller heartbeat.
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