BIND 10 #1817: Cleanup object for SQLite3 statements

[BIND 10 Development]

#1817: Cleanup object for SQLite3 statements
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            Reporter:  vorner        |                        Owner:
                Type:  task          |                       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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 We manually reset a SQLite3 statement each time it is used. This is both
 little bit too much code and can keep the statement not reset on some
 unexpected exception (which is not fatal, as we reset the statement before
 use again, but it is clearly not optimal).

 The task is to create a class that would hold the statement and reset it
 on destruction and use it to hold the statements inside the methods using
 them.

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Ticket URL: <http://bind10.isc.org/ticket/1817>
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