keep default as initial fallback (+1 squashed commit)

Squashed commits:
[038efa5] use display_default instead of default
Ref: #8593
`display_default` should now be used to generate defaults file

datadog_checks_dev/datadog_checks/dev/tooling/specs/configuration/consumers/model.py

@@ -34,7 +34,9 @@ def example_looks_informative(example):
 
 
 def get_default_value(type_data):
-    if 'default' in type_data:
+    if 'display_default' in type_data:
+        return type_data['display_default']
+    elif 'default' in type_data:
         return type_data['default']
     elif 'type' not in type_data or type_data['type'] in ('array', 'object'):
         return NO_DEFAULT