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

[BIND 10 Development]

#2750: support DomainTree::remove()
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |  vorner
            Priority:  medium        |                       Status:
           Component:  data source   |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130917
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  7             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |  shared memory data source
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 Replying to [comment:16 muks]:
 > I'm blocked on fixing this ticket as I need clarification on whether
 empty nodes are to be deleted upwards in the forest if the `DomainTree` is
 constructed to return empty nodes. In this case, its constructor argument
 name would also likely have to be changed as it's very `find()`-specific
 currently.
 >
 > Just removing empty nodes at the tree can also get rid of intentionally
 added empty nodes, so this needs clarification.

 #2752 gives some additional details and seems to want this behavior (of
 cleaning up empty nodes upwards).

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Ticket URL: <http://bind10.isc.org/ticket/2750#comment:18>
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