BIND 10 #1820: remove DNSService::addServer()

[BIND 10 Development]

#1820: remove DNSService::addServer()
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  reviewing
                       Type:         |             Milestone:
  defect                             |  Sprint-20120403
                   Priority:         |            Resolution:
  medium                             |             Sensitive:  0
                  Component:         |           Sub-Project:  DNS
  Unclassified                       |  Estimated Difficulty:  0
                   Keywords:         |           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:

 The code looks OK, but I have two questions nevertheless:
  * I think I saw the `ScopedSocket` somewhere already. Wouldn't it be
 possible to unify the occurrences?
  * The methods of the DNSService were removed. Should the corresponding
 constructors of the UDPServer, UDPSyncServer and TCPServer be removed as
 well in this ticket?

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Ticket URL: <http://bind10.isc.org/ticket/1820#comment:5>
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