BIND 10 #2089: RBTree node flags update

[BIND 10 Development]

#2089: RBTree node flags update
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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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 This is part of the big picture.

 - encode the node color in flags
 - introduce the "root" flag (only internally settable) to indicate
   a node is the root of a subtree.  carefully implement and test
   it - it's not trivial as the property can change due to
   insertion/rotation

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Ticket URL: <http://bind10.isc.org/ticket/2089>
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