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        |  jinmei
            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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Changes (by vorner):

 * owner:  vorner => jinmei


Comment:

 Hello

 I think it should be „reconfigured _at_ runtime“ in the changelog.

 Also, in the added test, the `this->stopIOService` looks awkward to me,
 because signal takes function, not a method. I guess it's a static method,
 so should it be called by :: instead of ->?

 Anyway, it seems OK, so please merge with or without changes to these.

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Ticket URL: <http://bind10.isc.org/ticket/2946#comment:8>
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