BIND 10 #2105: introduce node deleter of new RBTree

[BIND 10 Development]

#2105: introduce node deleter of new RBTree
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                   Reporter:         |                 Owner:  vorner
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120807
  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:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by muks):

 * owner:  muks => vorner


Comment:

 > > This can be added trivially, but do we have a use-case when it has to
 be released (and not deleted during overwrite)?
 >
 > I don't know. We probably don't. But it depends on if the header should
 be for our use inside in-memory only, or if it would be of general public
 use. In the second case, the interface would be incomplete and as the
 release would be simple, it would make no sense to create a new ticket for
 it. But I have no idea what is the direction about public interfaces at
 all.

 I've updated `setData()` for this.

 Also merged `nodeFission()` changes from #2054.

 Let me know your opinion on the other points.

-- 
Ticket URL: <https://bind10.isc.org/ticket/2105#comment:17>
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