add data handling of agent life cycles and events #780
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Add agent life cycle and event handling support mentioned in #84 to the Collector.This pull request only includes the receiving and storing part of the agent life cycle / event data, retrieval and querying for these data is not included yet.
2 tables were added to the HBase backend - one for agent life cycle, and one for agent events.
This implementation tracks the agent's connect / ping / disconnect events to determine the latest status of a single life cycle of the agents.
These life cycle events are also put into the event table to provide a separate history of events generated to/from the agent.