cfg-checker ceph bench module part 4

 - benchmark code refactoring/cleaning
 - using UTC timezone for scheduling
 - 'tasks' mode first version
 - updated agent poking response structure

 Related-PROD: PROD-36669

Change-Id: I8bf9d9b4d54a41cc04f7765e17efb675028c6262
diff --git a/cfg_checker/agent/webserver.py b/cfg_checker/agent/webserver.py
index 235ba1a..7f7e53a 100644
--- a/cfg_checker/agent/webserver.py
+++ b/cfg_checker/agent/webserver.py
@@ -158,6 +158,7 @@
                         logger.info("getting results for '{}'".format(_time))
                         resp.status = falcon.HTTP_200
                         resp.content_type = "application/json"
+                        # TODO: get timeline too?
                         resp.text = json.dumps({_time: _a(_time)})
                     elif _action == 'do_singlerun':
                         logger.info("executing single run")