BIND 10 #2110: redefine in-memory zone finder (wildcard)

[BIND 10 Development]

#2110: redefine in-memory zone finder (wildcard)
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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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 On top of #2109, we extend the new finder find() for the case of
 wildcard substitution.  When building a resulting `TreeNodeRRset`,
 allocate its "wild data" buffer from some pool (maybe in the data
 source client or finder) and build the expanded name label data there.

 Make sure TreeNodeRRset::toWire() use that data.

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Ticket URL: <http://bind10.isc.org/ticket/2110>
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