BIND 10 #2218: update InMemoryZoneFinder::findNSEC3 using memory-efficient version

[BIND 10 Development]

#2218: update InMemoryZoneFinder::findNSEC3 using memory-efficient version
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                   Reporter:         |                 Owner:  muks
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20121009
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  5
            Defect Severity:  N/A    |           Total Hours:  10.75
Feature Depending on Ticket:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by muks):

 I suspect `InMemoryClient::add()` uses some other member variables from
 the `InMemoryClient` object. For use from the tests, it should be made a
 `static` function ideally to work on the passed `ZoneData&` alone. I'll
 see about this in #2268.

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Ticket URL: <http://bind10.isc.org/ticket/2218#comment:25>
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