BIND 10 #1804: update the RBTreeNodeChain class to identify the "previous" node (2nd part)

[BIND 10 Development]

#1804: update the RBTreeNodeChain class to identify the "previous" node (2nd part)
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                   Reporter:         |                 Owner:  vorner
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120515
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  4
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:  in-    |
  memory NSEC                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by vorner):

 * owner:   => vorner
 * status:  new => accepted


Comment:

 I'm taking this, to stop anybody from implementing again what was done in
 #1803.

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Ticket URL: <http://bind10.isc.org/ticket/1804#comment:4>
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