Discovered via bug: controller_node field present in
project update list but not in detail view
Added tests to assert that "unified" list serializer
produces same fields as the ordinary serializer,
for unified jobs & unified JTs
Added test to check that list serializers do differ
from detail serializer except for allowed differences
Added test to check that list serializers are applied
correctly - only on list views, and that detail views,
likewise, do not use list serializers
Fix the many many bugs discovered by these new
testing mechanisms
8ae979908c