BIND 10 #2991: Fix ListTest.reloadNotAllowed testcase

[BIND 10 Development]

#2991: Fix ListTest.reloadNotAllowed testcase
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                   Reporter:  muks   |                 Owner:
                       Type:         |                Status:  new
  defect                             |             Milestone:  Next-Sprint-
                   Priority:         |  Proposed
  medium                             |              Keywords:
                  Component:  data   |             Sensitive:  0
  source                             |           Sub-Project:  DNS
               CVSS Scoring:         |  Estimated Difficulty:  0
            Defect Severity:  N/A    |           Total Hours:  0
Feature Depending on Ticket:         |
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 Now that we have `getCachedZoneWriter()`, the `ListTest`s use that in
 #2853 to fetch a `ZoneWriter`. This approach does not work for getting at
 a `ZoneWriter` when the cache is disabled. Hence
 `ListTest.reloadNotAllowed` testcase is broken as it tries to call
 `prepareCache()` with `enabled=true` when the cache is actually disabled.

 While it's straightforward to update it, I don't know what the purpose of
 this test is, and whether it should be kept still. So this ticket is
 created.

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Ticket URL: <http://bind10.isc.org/ticket/2991>
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