BIND 10 #2281: use new in-memory data source in the static data source

[BIND 10 Development]

#2281: use new in-memory data source in the static data source
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  medium        |                    Milestone:  Next-
           Component:  data source   |  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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 This is a deferred cleanup of #2219.

 In #2219, the static data source client still internally uses the
 older in-memory data source client.  We should switch it to the new
 one.  It shouldn't be difficult, but will be multi-line changes
 because we'll need to create and use a separate memory segment.

 When this is done, we should be able to remove old in-memory
 implementations, and I suggest doing that within this ticket.  Those
 include
 - datasrc/memory_datasrc.cc
 - datasrc/memory_datasrc.h
 - datasrc/memory_datasrc_link.h
 - datasrc/tests/memory_datasrc_unittest.cc (check if (reasonably)
   ported all tests to the tests for the new implementation).

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Ticket URL: <http://bind10.isc.org/ticket/2281>
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