Use new SensorDataStore::insertBatch() function to improve CollectAgent ingress rate

CollectAgent/collectagent.cpp

@@ -201,11 +201,14 @@ int mqttCallback(SimpleMQTTMessage *msg)
               }
               cout << endl;
 #endif
+	      std::list<DCDB::SensorDataStoreReading> readings;
               for (uint64_t i = 0; i < len / sizeof(mqttPayload); i++) {
-                  mySensorDataStore->insert(&sid, payload[i].timestamp, payload[i].value);
+		  DCDB::SensorDataStoreReading r(sid, payload[i].timestamp, payload[i].value);
+		  readings.push_back(r);
                   mySensorCache.storeSensor(sid, payload[i].timestamp, payload[i].value);
-
               }
+	      mySensorDataStore->insertBatch(readings);
+
               //mySensorCache.dump();
           }
 #if 1