BIND 10 #2299: use the shortcut DomainTree::find() for finding wildcard

[BIND 10 Development]

#2299: use the shortcut DomainTree::find() for finding 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             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 I believe the wildcard case of zone_finder.cc:findNode() can
 use the shortcut version of find()

 {{{#!cpp
             // Clear the node_path so that we don't keep incorrect (NSEC)
             // context
             node_path.clear();
             ZoneTree::Result result = tree.find(wildcard_ls, &node,
 node_path,
                                                 cutCallback, &state);
 }}}
 that is, rather than clearing the known path, use the current context
 with the single label of '*' as the search key
 (`LabelSequence::WILDCARD()`).

 This should make the code simpler and faster.  (and, in fact, if we
 don't do this, #2150 would become mostly a waste.)

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Ticket URL: <http://bind10.isc.org/ticket/2299>
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BIND 10 Development