BIND 10 #2935: the "checkin" callback for asiodns server classes should be removed

[BIND 10 Development]

#2935: the "checkin" callback for asiodns server classes should be removed
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  b10-auth      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130806
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  3             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by muks):

 * owner:  muks => UnAssigned
 * status:  assigned => reviewing


Comment:

 After updating `libb10-asiodns` to remove the checkin callback completely,
 I noticed that `libb10-resolve` requires this callback for its testing.
 See `recursive_query_unittest.cc`, etc. It seems we cannot remove this
 callback.

 The partial work has been pushed to `trac2935`. Please advise in review.

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Ticket URL: <http://bind10.isc.org/ticket/2935#comment:5>
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