BIND 10 #1454: Pass UPDATE packets from b10-auth to DDNS module

[BIND 10 Development]

#1454: Pass UPDATE packets from b10-auth to DDNS module
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            Reporter:  jelte         |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    Milestone:  Next-
           Component:  DDNS          |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  DDNS
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 (again, barring a general receptionist or receptionist-like framework), we
 need to be able to pass on DDNS UPDATE packets from b10-auth to the ddns
 module from #1451.

 For UDP support, this also depends on #1453.

 If there is extra code involved that is similar to the one used in the
 xfr's, we should put this in a shared python module somewhere.

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Ticket URL: <http://bind10.isc.org/ticket/1454>
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