BIND 10 #1601: pass reference instead of shared pointer within AuthSrv

[BIND 10 Development]

#1601: pass reference instead of shared pointer within AuthSrv
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  assigned
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20120306
                  Component:         |            Resolution:
  b10-auth                           |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  3
Feature Depending on Ticket:  auth   |           Total Hours:  0
  performance                        |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by vorner):

 * owner:  vorner => UnAssigned
 * status:  accepted => assigned


Comment:

 It should be ready for review. I first tried to change the interface of
 the callbacks, but I got completely lost in the resolver code (which
 needed to be changed as well as the result). So this changes it inside the
 authoritative processing only.

 I don't think this needs a changelog entry, as this does not change any
 public API. The speedup won't be too large either, I think (but I didn't
 test it).

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Ticket URL: <http://bind10.isc.org/ticket/1601#comment:7>
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