BIND 10 #440: Update of ZoneTable to use the RBTree

[BIND 10 Development]

#440: Update of ZoneTable to use the RBTree
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  Reporter:  vorner       |            Owner:  vorner
      Type:  task         |           Status:  new   
  Priority:  major        |        Milestone:        
 Component:  data source  |         Keywords:        
 Sensitive:  0            |   Estimatedhours:  0     
     Hours:  0            |         Billable:  1     
Totalhours:  0            |         Internal:  0     
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 This branch replaces the map in ZoneTable with RBTree, which should be
 faster and  more clever in finding closest match.

 It, however, does not implement the removeZone method, since RBTree does
 not have any interface for removal of data, so I suggest this is postponed
 and a new task is created for it.

 I think, as this is intermediate part of larger work on the in-memory data
 source, that it doesn't need a changelog entry. But I still do these
 guesses wrong, so if there should be one, tell me, please.

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Ticket URL: <http://bind10.isc.org/ticket/440>
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BIND 10 Development