Cleaning up more TODOs.

removing TODO on line 162 of ofagent/agent.py
and entering it into backlog as CORD-820

removing TODO on line 195 of ofagent/connection_mgr.py
and entering it into backlog as CORD-821

removing TODO on line 58 of ofagent/of_protocol_handler.py
and entering it into backlog as CORD-822

removing TODO on line 103 of ofagent/of_protocol_handler.py
and entering it into backlog as CORD-823

removing TODO on line 135 of ofagent/of_protocol_handler.py
and entering it into backlog as CORD-824

removing TODO on line 226 of ofagent/of_protocol_handler.py
and entering it into backlog as CORD-825

removing TODO on line 146 of ofagent/of_protocol_handler.py
and entering it into backlog as CORD-826

Change-Id: Ie647a7d278fa742bfe7edfd0a36243b153c5def9
diff --git a/ofagent/connection_mgr.py b/ofagent/connection_mgr.py
index 6182b90..9ccf115 100644
--- a/ofagent/connection_mgr.py
+++ b/ofagent/connection_mgr.py
@@ -192,8 +192,8 @@
     @inlineCallbacks
     def monitor_logical_devices(self):
         while True:
-            # TODO @khen We should switch to a polling mode based on a
-            # streaming gRPC method
+            # should change to a gRPC streaming call
+            # see https://jira.opencord.org/browse/CORD-821
 
             # get current list from Voltha
             devices = yield self.get_list_of_logical_devices_from_voltha()