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          |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  data source   |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20131015
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  4             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by muks):

 No `ChangeLog` entry is necessary as it is a performance optimization only
 that has no other user-visible effect.

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Ticket URL: <https://bind10.isc.org/ticket/2299#comment:2>
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