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:  task   |                Status:  new
                   Priority:         |             Milestone:  Next-Sprint-
  medium                             |  Proposed
                  Component:  data   |            Resolution:
  source                             |             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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Comment (by jinmei):

 Assuming this means InMemoryZoneFinder::findPreviousName(), we don't
 need this for the "NSEC in in-memory" feature as far as I understand it.
 In fact, we don't need findPreviousName() in any derived `ZoneFinder`
 classes.  I've been wondering we should rather remove it to keep
 the interface simpler (also to be aligned with YAGNI).

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Ticket URL: <http://bind10.isc.org/ticket/1798#comment:3>
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