BIND 10 #2759: apply check_zone before commiting DDNS changes

[BIND 10 Development]

#2759: apply check_zone before commiting DDNS changes
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  vorner
            Priority:  medium        |                       Status:
           Component:  DDNS          |  reviewing
            Keywords:                |                    Milestone:
           Sensitive:  0             |  Sprint-20130709
         Sub-Project:  DNS           |                   Resolution:
Estimated Difficulty:  3             |                 CVSS Scoring:
         Total Hours:  0             |              Defect Severity:  N/A
                                     |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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Changes (by muks):

 * owner:  muks => vorner


Comment:

 On Jabber, Jinmei said that we have to return rcode=REFUSED for validation
 failures. So I have changed the code to do so.

 I've also added a lettuce test that checks that the user gets this code
 and validation works at a system level. Please review them.

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Ticket URL: <http://bind10.isc.org/ticket/2759#comment:12>
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