BIND 10 #2310: In-memory version of ZoneFinder::findAtOrigin()

[BIND 10 Development]

#2310: In-memory version of ZoneFinder::findAtOrigin()
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       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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 See #2283 and #2309.

 This is the optimized version of #2309.  This version can
 skip findNode() and begin with zone data's getOriginNode().

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Ticket URL: <http://bind10.isc.org/ticket/2310>
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