cfg-checker bench part 1

 - first single test debug portion
 - updated fio option extraction
 - updated date interaction
 - fixed agent error showing and handling

 Related-PROD: PROD-36669

Change-Id: I7c1014c01b5b84429f112bff8db5ad34944c4644
diff --git a/cfg_checker/agent/webserver.py b/cfg_checker/agent/webserver.py
index 8b8466c..67a4567 100644
--- a/cfg_checker/agent/webserver.py
+++ b/cfg_checker/agent/webserver.py
@@ -165,7 +165,7 @@
                     )
                 return
         else:
-            _resp(falcon.HTTP_400, "Empty request body")
+            _resp(resp, falcon.HTTP_400, "Empty request body")
 
 
 class Index: