BIND 10 #1798: NSEC in-mem: implement findPreviousName()

[BIND 10 Development]

#1798: NSEC in-mem: implement findPreviousName()
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            Reporter:  jelte         |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:
           Component:  data source   |  Sprint-20120320
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Base dependency for NSEC support; we need to implement the currently
 throwing findPreviousName() method in memory_datasrc

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Ticket URL: <http://bind10.isc.org/ticket/1798>
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