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:  muks
  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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Comment (by muks):

 Replying to [comment:22 vorner]:
 > Hello
 >
 > Replying to [comment:21 muks]:
 > > One more change we can do is use a `DT::delete()` static method
 instead of `operator()` and not have to create instances of DT.
 >
 > Yes, we could. But is there an advantage to it?
 >
 > Unless you want to do the change, I think it can be merged.

 Just that there's no need to create instances of the DeleterType. Anyway,
 I'll leave it as it is for now.

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Ticket URL: <https://bind10.isc.org/ticket/2105#comment:23>
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