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:         |             Milestone:
  medium                             |  Sprint-20120529
                  Component:  DDNS   |            Resolution:
                   Keywords:         |             Sensitive:  0
            Defect Severity:  N/A    |           Sub-Project:  DNS
Feature Depending on Ticket:  DDNS   |  Estimated Difficulty:  6
        Add Hours to Ticket:  0      |           Total Hours:  0
                  Internal?:  0      |
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Description changed by jinmei:

Old description:

> 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.

New description:

 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.

 It's probably better to start this task after #1512 (at least after
 we agree on its basic code structure).

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Ticket URL: <http://bind10.isc.org/ticket/1455#comment:8>
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