System tests fail on none config reports
Refers to: test_get_dhcp4_config_review_reports
test case.
The Stork Server returns HTTP 204 No Content status if the config review is not performed yet for a given daemon. It is correctly described in the Swagger YAML file. The server sends only HTTP status and no data in response.
Unfortunately, it seems that the Python OpenAPI client doesn't support No Content status and always expects that the config reviews will be included in the server response.
It causes the system tests may sporadically fail on listing the reviews. Additionally, we need a function to wait for complete review for a given daemon.