BIND 10 #2240: add all zones by default with data_sources cache-enable

[BIND 10 Development]

#2240: add all zones by default with data_sources cache-enable
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            Reporter:  jreed         |                        Owner:
                Type:  enhancement   |                       Status:  new
            Priority:  medium        |                    Milestone:  New
           Component:  data source   |  Tasks
           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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 Currently when cache-enable is true for a data source, then all the zones
 not listed in cache-zones become unavailable.

 vorner suggested loading all by default.

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Ticket URL: <http://bind10.isc.org/ticket/2240>
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BIND 10 Development