BIND 10 #1455: Add prerequisite checks to the DDNS module

[BIND 10 Development]

#1455: Add prerequisite checks to the DDNS module
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            Reporter:  jelte  |                        Owner:
                Type:  task   |                       Status:  new
            Priority:  major  |                    Milestone:  New Tasks
           Component:  DDNS   |                     Keywords:
           Sensitive:  0      |              Defect Severity:  N/A
         Sub-Project:  DNS    |  Feature Depending on Ticket:  DDNS
Estimated Difficulty:  0      |          Add Hours to Ticket:  0
         Total Hours:  0      |                    Internal?:  0
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 This is the prerequisite checking part of RFC 2136.

 Though technically it needs #1454 to get the DNS packet in the first
 place, we can start working on this before that is finished (with unit
 tests). It is dependent on #1451 though.

 If there is a logical way to split them up (check for the various types of
 prerequisites), the task of this ticket is to create the subtickets, and
 this will become a metaticket for those tasks.

 Note for estimation: please estimate for the full work, even if we do
 split it up.

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Ticket URL: <http://bind10.isc.org/ticket/1455>
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BIND 10 Development