BIND 10 #552: get the "closest previous node" in RBTree find()

[BIND 10 Development]

#552: get the "closest previous node" in RBTree find()
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                 Reporter:  jinmei   |                Owner:
                     Type:           |               Status:  new
  enhancement                        |            Milestone:  A-Team-Task-
                 Priority:  major    |  Backlog
                Component:  data     |           Resolution:
  source                             |            Sensitive:  0
                 Keywords:           |  Add Hours to Ticket:  0
Estimated Number of Hours:  8.0      |          Total Hours:  0
                Billable?:  1        |
                Internal?:  0        |
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Comment (by jinmei):

 Additional note: we probably don't need this for wildcard handling.
 See also: http://bind10.isc.org/ticket/553#comment:2

 "Getting previous" will still be necessary for DNSSEC support, but
 it can be deferred.

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Ticket URL: <http://bind10.isc.org/ticket/552#comment:2>
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