BIND 10 #1791: update InMemoryZoneFinder::load() to support sqlite3 backend

[BIND 10 Development]

#1791: update InMemoryZoneFinder::load() to support sqlite3 backend
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                   Reporter:         |                 Owner:  jinmei
  jinmei                             |                Status:  accepted
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120417
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  5
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:  xfr    |
  for in-memory                      |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Comment (by jinmei):

 trac1791 is ready for review.

 The first commit is a setup for subsequent tests.  The amount of
 change may look a bit large, but it's essentially a trivial
 refactoring that moves code from zone_finder_context_unittest to the
 new file.

 I also made a not-directly-related bug fix (b446618).  see the commit
 log and change.

 Other than that it should be pretty straightforward implementation of
 what is stated in the ticket.

 Due to the bug fix I think we need a changelog entry (for that
 specific part):

 {{{
 422.?   [bug]           jinmei
         The database based zone iterator now separates RRSIGs of the same
         name and type but for different covered types.
         (part of Trac #1791, git b4466188150a50872bc3c426242bc7bba4c5f38d)
 }}}

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Ticket URL: <http://bind10.isc.org/ticket/1791#comment:4>
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