Fixing a deprecation warning in OnePing.java

Bumping priority of packet requests.

Change-Id: I89d0c58d75d0919a0befe19fb7fb26bfa01f2042
diff --git a/oneping/src/main/java/org/onos/oneping/OnePing.java b/oneping/src/main/java/org/onos/oneping/OnePing.java
index 038921a..0b16b13 100644
--- a/oneping/src/main/java/org/onos/oneping/OnePing.java
+++ b/oneping/src/main/java/org/onos/oneping/OnePing.java
@@ -48,6 +48,7 @@
 import org.slf4j.LoggerFactory;
 
 import java.util.Objects;
+import java.util.Optional;
 import java.util.Timer;
 import java.util.TimerTask;
 
@@ -107,7 +108,8 @@
                                                 () -> log.info("Periscope down."));
         packetService.addProcessor(packetProcessor, PRIORITY);
         flowRuleService.addListener(flowListener);
-        packetService.requestPackets(intercept, PacketPriority.REACTIVE, appId);
+        packetService.requestPackets(intercept, PacketPriority.CONTROL, appId,
+                                     Optional.empty());
         log.info("Started");
     }