BIND 10 #2109: redefine in-memory zone finder (basic)

[BIND 10 Development]

#2109: redefine in-memory zone finder (basic)
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                   Reporter:         |                 Owner:  UnAssigned
  jinmei                             |                Status:  reviewing
                       Type:  task   |             Milestone:
                   Priority:         |  Sprint-20120918
  medium                             |            Resolution:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
                   Keywords:         |  Estimated Difficulty:  7
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
  scalable inmemory                  |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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Changes (by jelte):

 * owner:  jelte => UnAssigned
 * status:  assigned => reviewing


Comment:

 Ready for review! (finally).

 The important parts are in the new
 src/lib/datasrc/memory/zone_finder.[h|cc] files.

 It is essentially the same implementation as in the original
 memory_datasrc, but using the new structures. I did however modify it
 somewhat (removed now unnecessary pimpl and template constructs, and
 updated logic as necessary to use the new data structures).

 The tests are updated too, they no longer need load(), but add rrs to the
 ZoneData structure themselves.

 I also ported the general structure for doing wildcards and nsec3 testing,
 but those are disabled pending #2110 and #2218.

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Ticket URL: <http://bind10.isc.org/ticket/2109#comment:7>
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