BIND 10 #1452: add UDP socket passing to fd_X handling

[BIND 10 Development]

#1452: add UDP socket passing to fd_X handling
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                   Reporter:  jelte  |                 Owner:  vorner
                       Type:  task   |                Status:  reviewing
                   Priority:  major  |             Milestone:
                  Component:  DDNS   |  Sprint-20111220
                   Keywords:         |            Resolution:
            Defect Severity:  N/A    |             Sensitive:  0
Feature Depending on Ticket:  DDNS   |           Sub-Project:  DNS
        Add Hours to Ticket:  0      |  Estimated Difficulty:  5
                  Internal?:  0      |           Total Hours:  0
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Comment (by jinmei):

 The python wrapper part is also ready for review at branch trac1452b.

 The first few commits were for importing the C++ part (trac1452) and
 should be ignored.  The effective branch point is commit 9d39266.

 If it's better to create a separate ticket for the review of the
 python part please let me know.

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Ticket URL: <http://bind10.isc.org/ticket/1452#comment:15>
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