BIND 10 #2033: remove ZoneFinder::findPreviousName()

[BIND 10 Development]

#2033: remove ZoneFinder::findPreviousName()
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  data source   |  Sprint-Proposed
           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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 This method was somehow introduced but has never been used except for
 tests (and it increases the cost of writing tests because we need to
 define it just because the base class requires it).  We should clean
 it up.

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Ticket URL: <http://bind10.isc.org/ticket/2033>
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