BIND 10 #3293: Check zone loading failure cases in system tests

[BIND 10 Development]

#3293: Check zone loading failure cases in system tests
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                   Reporter:  muks    |                 Owner:
                       Type:  defect  |                Status:  new
                   Priority:  medium  |             Milestone:  New Tasks
                  Component:  tests   |              Keywords:
               CVSS Scoring:          |             Sensitive:  0
            Defect Severity:  N/A     |           Sub-Project:  DNS
Feature Depending on Ticket:          |  Estimated Difficulty:  0
        Add Hours to Ticket:  0       |           Total Hours:  0
                  Internal?:  0       |
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 We should introduce system tests (lettuce) to try and load bad zone data
 into `b10-auth` and verify that the server does not crash with unhandled
 exceptions, etc. These conditions should be gracefully handled.

 Currently zone load failures are tested at the unittest level, but these
 are tested to see whether they correctly throw exceptions or not.
 `b10-auth`'s behavior needs to be tested at the system test level.

 A lack of such tests is severe enough to be a defect.

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Ticket URL: <https://bind10.isc.org/ticket/3293>
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