BIND 10 #1787: update in-memory zone after xfrin

[BIND 10 Development]

#1787: update in-memory zone after xfrin
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  Unclassified  |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 Currently only the SQLite3 data source can be updated via incoming xfr.
 We can extend this to in-memory with some extensions to b10-auth,
 b10-xfrin, and the in-memory data source implementations.  I propose
 this feature for the end of y3 release.  For the limited period of
 development, it'd have to be a kind of hack, assuming sqlite3 only,
 etc.

 This is a meta ticket for that feature.

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Ticket URL: <http://bind10.isc.org/ticket/1787>
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