Try fixing unit tests

Author: neiser

Diff for: locust/contrib/fasthttp.py

@@ -606,6 +606,7 @@ def __exit__(self, exc, value, traceback):
                 return False
         else:
             try:
+                self.content()  # explicitly await fetching the response completely
                 self.raise_for_status()
             except FAILURE_EXCEPTIONS as e:
                 self.request_meta["exception"] = e