Remove unused arguments

The "response_checker" method has unused arguments ("url", "headers", "body").
So method does not need them and we can remove them.

Change-Id: I8b3a25513693e6a950fc44a8da5ae9549c13a23d
diff --git a/tempest/common/rest_client.py b/tempest/common/rest_client.py
index 8c07d4f..360f440 100644
--- a/tempest/common/rest_client.py
+++ b/tempest/common/rest_client.py
@@ -369,7 +369,7 @@
             # Parse one-item-like xmls (user, role, etc)
             return common.xml_to_json(element)
 
-    def response_checker(self, method, url, headers, body, resp, resp_body):
+    def response_checker(self, method, resp, resp_body):
         if (resp.status in set((204, 205, 304)) or resp.status < 200 or
                 method.upper() == 'HEAD') and resp_body:
             raise exceptions.ResponseWithNonEmptyBody(status=resp.status)
@@ -413,8 +413,7 @@
                           resp_body=resp_body)
 
         # Verify HTTP response codes
-        self.response_checker(method, url, req_headers, req_body, resp,
-                              resp_body)
+        self.response_checker(method, resp, resp_body)
 
         return resp, resp_body