BIND 10 #1962: complete getClosestNSEC() using getPreviousNode()

[BIND 10 Development]

#1962: complete getClosestNSEC() using getPreviousNode()
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:
           Component:  data source   |  Sprint-20120515
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  in-
         Total Hours:  0             |  memory NSEC
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 This is a latter half of #1805 and should complete the
 getClosestNSEC() method using the getPreviousNode() interface provided
 by #1803 and #1804.  It depends on all these tickets.

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Ticket URL: <http://bind10.isc.org/ticket/1962>
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