BIND 10 #1789: update xfrin to maintain in-memory/sqlite3 zones

[BIND 10 Development]

#1789: update xfrin to maintain in-memory/sqlite3 zones
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  xfrin         |  Sprint-Proposed
           Sensitive:  0             |                     Keywords:
         Sub-Project:  DNS           |              Defect Severity:  N/A
Estimated Difficulty:  0             |  Feature Depending on Ticket:  xfr
         Total Hours:  0             |  for in-memory
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 This is a subtask of #1787.

 In this task we update b10-xfrin so that it gets and maintains a list of
 zones served by b10-auth in the in-memory data source using sqlite3 as
 a backend.  xfrin already refers to auth's configuration, so this
 extension
 should not be very difficult.

 This task depends on #1788.

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Ticket URL: <http://bind10.isc.org/ticket/1789>
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BIND 10 Development