reworked JS challenge tests. The main motivation - old tests checked …

…Js challenge inside vhost, but did not explain the work process.

`JSChallengeVhost` and `JSChallengeDefVhostInherit` removed because it is duplicate for `VhostCookies` and `CookiesInherit` from `sessions.test_cookies`

New tests:
- a bad first request (`POST` method or invalid `Accept` header);
- second request  is not equal first;
- the number of invalid requests is greater than `max_misses`;
- block after Tempesta restart;
- block after connection restart;
- resp_code;

framework/deproxy_client.py

@@ -294,6 +294,10 @@ def make_requests(self, requests: list or str, pipelined=False) -> None:
             for request in requests:
                 self.__check_request(request)
 
+            requests = [
+                request if isinstance(request, str) else request.msg for request in requests
+            ]
+
             if pipelined:
                 self._add_to_request_buffers("".join(requests))
                 self.valid_req_num += len(requests)