BIND 10 #1894: use labelsequence in findNSEC3

[BIND 10 Development]

#1894: use labelsequence in findNSEC3
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            Reporter:  jelte         |                        Owner:
                Type:  enhancement   |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  Unclassified  |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20131015
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  5             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by muks):

 * owner:   => UnAssigned
 * status:  new => reviewing
 * milestone:   => Sprint-20131015


Comment:

 Up for review. The `Name` variant of `calculate()` was also optimized
 (this was necessary anyway to reuse the same code in the `LabelSequence`
 variant of `calculate()` that was added later.

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Ticket URL: <http://bind10.isc.org/ticket/1894#comment:3>
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