BIND 10 #1911: document how to configure in-memory data source with sqlite3 backend

[BIND 10 Development]

#1911: document how to configure in-memory data source with sqlite3 backend
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:                |  Sprint-Proposed
  documentation                      |                     Keywords:
           Sensitive:  0             |              Defect Severity:  N/A
         Sub-Project:  DNS           |  Feature Depending on Ticket:  xfr
Estimated Difficulty:  0             |  for in-memory
         Total Hours:  0             |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 ...and about its implication for updating in-memory zone after inbound
 xfrs.

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Ticket URL: <http://bind10.isc.org/ticket/1911>
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