BIND 10 #1061: introduce DatabaseClient (or DatabaseDataSourceClient)

[BIND 10 Development]

#1061: introduce DatabaseClient (or DatabaseDataSourceClient)
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            Reporter:  jinmei        |                        Owner:
                Type:  task          |                       Status:  new
            Priority:  major         |                    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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 In this task, we add a minimum level of additional support for
 SQLite3, implementing the following:

 - DatabaseConnection (abstract) class.  At the moment we only need the
   constructor and the getZone() method.
 - SQLite3Connection class.  Implement the constructor, which opens the
   underlying SQLite3 DB, and getZone() method.
 - Implement findZone() method.  At this point the returned ZoneHandle
   (DatabaseZoneHandle) can be empty.

 For SQLite3 specific code, use the exiting sqlite3_datasrc
 implementation when possible.

 This task depends on #1060.

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Ticket URL: <http://bind10.isc.org/ticket/1061>
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BIND 10 Development