BIND 10 #2182: Simplify and make RBTree::deleteHelper() non-recursive

[BIND 10 Development]

#2182: Simplify and make RBTree::deleteHelper() non-recursive
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            Reporter:  muks          |                        Owner:  muks
                Type:  enhancement   |                       Status:  new
            Priority:  low           |                    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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 The code in `RBTree::deleteHelper()` is more complicated than it needs to
 be. This is a cleanup, that also makes it non-recursive by iteratively
 walking the trees.

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Ticket URL: <http://bind10.isc.org/ticket/2182>
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