BIND 10 #2338: Add tests for ZoneDataUpdater

[BIND 10 Development]

#2338: Add tests for ZoneDataUpdater
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            Reporter:  muks          |                        Owner:
                Type:  defect        |                       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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 Bug #2268 introduced the `ZoneDataUpdater` class. It did not add tests as
 these are covered already by `InMemoryClient`'s tests. There are many
 testcases to do with validation that are in `InMemoryClient`'s tests (the
 `ZoneDataUpdater` code used to first be a part of `InMemoryClient`).

 This bug is to add direct tests for `ZoneDataUpdater` by porting all the
 data related tests from `InMemoryClient`'s tests.

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Ticket URL: <http://bind10.isc.org/ticket/2338>
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