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:  0.52          |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Comment (by jinmei):

 Replying to [comment:8 vorner]:

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

 Okay, added it in the actual changelog entry.

 > 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 ->?

 On a closer look I realized we simply didn't need any prefix, `this`
 or `DNSServerTestBase` as it's a public (static) member of a base
 class.  I changed it that way, and merged.

 Now closing.

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Ticket URL: <http://bind10.isc.org/ticket/2946#comment:10>
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