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:  assigned
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120925
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  5
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by muks):

 Up for review. It is in the `trac2218_2` branch.

 When you are following the code, note that the NSEC3 tree is again a tree-
 of-trees, and we work only in the sub-tree under the origin node. NSEC3
 names have 1+ the number of origin labels, and all of them are in the sub-
 tree under the origin node. Some changes to `DomainTree` were introduced
 to help with this.
 Insertion into the NSEC3 tree has to be done with the full and absolute
 names, as these are later used by `TreeNodeRRset::getName()` as the
 `RdataSet` itself contains no name.

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Ticket URL: <http://bind10.isc.org/ticket/2218#comment:5>
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