BIND 10 #1206: Create datasource factory

[BIND 10 Development]

#1206: Create datasource factory
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                   Reporter:         |                 Owner:
  stephen                            |                Status:  new
                       Type:  task   |             Milestone:
                   Priority:  major  |  Sprint-20110927
                  Component:  data   |            Resolution:
  source                             |             Sensitive:  0
                   Keywords:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  4
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jelte):

 Do we want the datasource backends to be dynamically loadable (with
 dlopen()) or can we hardcode them and provide a name->type link?
 (optionally; 'for now')

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Ticket URL: <http://bind10.isc.org/ticket/1206#comment:2>
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