Jonathan Hart 54119bbe6b Add neighbor lifecycle management.
* Made PIMNeighbor mostly immutable (apart from updatable timestamp)
 * Equals and hashCode for PIMNeighbor
 * Remove neighbor when we see a HELLO with holdTime==0
 * Periodic task to time out neighbors who haven't sent a HELLO in a while
 * Added a CLI command to view PIM neighbors

Change-Id: I59e52a847f7abcb8e9ac660c2cccace53e46867b
2016-02-10 15:05:47 -08:00
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