BIND 10 #1894: use labelsequence in findNSEC3

[BIND 10 Development]

#1894: use labelsequence in findNSEC3
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            Reporter:  jelte         |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  Unclassified  |  Tasks
           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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 in findNSEC3 (both for db and mem backends) we use Name::split() a number
 of times, before hashing the result. We could use the LabelSequence class
 for this, instead of the copying Name::split() call.

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