Fix return overrides to override error bodies (#2815)

The previous PR #2731 contained an error, and always forced return custom error: which brakes backward compatibility. In this PR I added tests covering all return overrides functionality and normalized its behavior for JSVM and Python. Additionally, it use reverse logic now, and plugin needs set `ReturnOverrides.OverrideError` (JS) or `return_overrides.override_error` (Python) to `true` in order to override the body of response. Additionally, I renamed `response_error` field to `response_body`, because it makes way more sense. The old field still can be set for backward compatibility. #2693
TykTechnologies · Jan 21, 2020 · 3fd2820 · 3fd2820
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diff --git a/coprocess/bindings/python/coprocess_common_pb2.py b/coprocess/bindings/python/coprocess_common_pb2.py
diff --git a/coprocess/bindings/python/coprocess_mini_request_object_pb2.py b/coprocess/bindings/python/coprocess_mini_request_object_pb2.py
diff --git a/coprocess/bindings/python/coprocess_object_pb2.py b/coprocess/bindings/python/coprocess_object_pb2.py