BIND 10 #1895: regression fix: set B10_FROM_BUILD for auth config tests

[BIND 10 Development]

#1895: regression fix: set B10_FROM_BUILD for auth config tests
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            Reporter:  jinmei        |                        Owner:
                Type:  defect        |  UnAssigned
            Priority:  very high     |                       Status:  new
           Component:  build system  |                    Milestone:
           Sensitive:  0             |  Sprint-20120417
         Sub-Project:  DNS           |                     Keywords:
Estimated Difficulty:  0             |              Defect Severity:  N/A
         Total Hours:  0             |  Feature Depending on Ticket:
                                     |          Add Hours to Ticket:  0
                                     |                    Internal?:  0
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 We need to specify B10_FROM_BUILD in
 `MemoryDatasrcConfigTest.addOneWithFiletypeSQLite3`
 for the loadable data source module.  This will fix regressions like
 this:
 http://git.bind10.isc.org/~tester/builder//BIND10/20120416211101-OpenBSD5-amd64/logs/unittests.out

 This is not a one-liner fix, so I'm creating a separate ticket.
 I'll push it to the current sprint for its urgency.

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Ticket URL: <http://bind10.isc.org/ticket/1895>
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