BIND 10 #2100: Update `ZoneTable` class

[BIND 10 Development]

#2100: Update `ZoneTable` class
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    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             |  scalable inmemory
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 So it will use the new version of RBTree.  It needs to pass a
 MemorySegment, but otherwise it should be pretty straightforward.

 Depend on #2090.

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Ticket URL: <http://bind10.isc.org/ticket/2100>
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