BIND 10 #2750: support DomainTree::delete()

[BIND 10 Development]

#2750: support DomainTree::delete()
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                   Reporter:         |                 Owner:
  jinmei                             |                Status:  new
                       Type:  task   |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 We need this interface to complete incremental update to in-memory
 zone data after IXFR-in or DDNS.  This is largely to implement to
 the delete operation for a red-black tree, so it's just a matter of
 porting of existing BIND 9 or whatever code of the algorithm plus
 careful tests.  So, in some sense, it should be an easy task, but
 deleting a node from redblack tree is complicated, so it will still
 require some amount of time.

 Also note: the tree-of-trees nature of `DomainTree` will make some
 additional work.

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Ticket URL: <http://bind10.isc.org/ticket/2750>
BIND 10 Development <http://bind10.isc.org>
BIND 10 Development