BIND 10 #2946: avoid handling DNSServer events after free

[BIND 10 Development]

#2946: avoid handling DNSServer events after free
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  medium        |                       Status:
           Component:  b10-auth      |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130528
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  5             |                 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 jinmei):

 note: buildbots reported some build errors, so I updated the branch.
 I believe it now builds on these platforms.  Due to the additional
 commit "the last commit" I mentioned in my previous ticket comment
 is not last anymore.  It's commit 935c7cc.

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Ticket URL: <https://bind10.isc.org/ticket/2946#comment:6>
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