BIND 10 #2108: redefine in-memory zone load()

[BIND 10 Development]

#2108: redefine in-memory zone load()
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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:  6
            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 muks):

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


Comment:

 This bug is up for review in the `trac2108_3` branch.

 Notes to the reviewer:

 * The branch is best reviewed as a single diff, and not in pieces as there
 are too many commits. It will be easier to review as a single diff. Please
 study the interface in `memory_client.h` first.
 * There are changes to other classes too which were required for the
 `InMemoryClient` implementation. Changes to these should be
 straightforward to review.
 * Note that there's no concept of `ZoneFinder` inside the `InMemoryClient`
 implementation (which is different from the one in the `datasrc`
 directory.
 * A `findZone2()` method has been introduced as
 `DataSourceClient::findZone()`'s definition has a type different from what
 we'll be using in `datasrc::memory`.

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Ticket URL: <http://bind10.isc.org/ticket/2108#comment:4>
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