[PostGIS] #3610: Switch garden tests to utilize JSON (or JSONB) for log storage

[PostGIS]

#3610: Switch garden tests to utilize JSON (or JSONB) for log storage
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  Reporter:  robe          |      Owner:  robe
      Type:  task          |     Status:  new
  Priority:  medium        |  Milestone:  PostGIS Fund Me
 Component:  QA/testsuite  |    Version:  master
Resolution:                |   Keywords:
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Changes (by strk):

 * component:  build => QA/testsuite

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3610#comment:6>
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