Minor updates for pkt in monitoring

Response to comment for rename of packet count
Clarified periodic_task name
Indentation
diff --git a/src/python/oftest/controller.py b/src/python/oftest/controller.py
index 404b185..935adce 100644
--- a/src/python/oftest/controller.py
+++ b/src/python/oftest/controller.py
@@ -697,10 +697,10 @@
         Clear the input queue and report the number of messages
         that were in it
         """
-        enqueued_pkts = len(self.packets)
+        enqueued_pkt_count = len(self.packets)
         with self.packets_cv:
             self.packets = []
-        return enqueued_pkts
+        return enqueued_pkt_count
 
     def __str__(self):
         string = "Controller:\n"