BIND 10 #2975: Create initial DnsClient class

[BIND 10 Development]

#2975: Create initial DnsClient class
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                   Reporter:  tmark  |                 Owner:
                       Type:         |                Status:  new
  enhancement                        |             Milestone:  Sprint-
                   Priority:         |  DHCP-20130606
  medium                             |              Keywords:
                  Component:  dhcp   |             Sensitive:  0
               CVSS Scoring:         |           Sub-Project:  DHCP
            Defect Severity:  N/A    |  Estimated Difficulty:  0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Define the public interface for DnsClient class and create the initial
 stubimplementation.  The interface should support methods for:
 1. Packet Construction, given the following data:
     a: update type
     b: zone
     b: pre-requisites
     c: updates

 2. Packet exchange given:
     a: constructed packet
     b: server information
     c: callback method

 Note that it would be best if the callback supported setting it to a class
 instance method, NOT a static function.

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Ticket URL: <http://bind10.isc.org/ticket/2975>
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BIND 10 Development