Fix the format of warning msg

Change-Id: I82a02bd088b025d4483297e46c64f63653a63663
diff --git a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
index 1423e06..9c761e7 100644
--- a/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
+++ b/apps/segmentrouting/src/main/java/org/onosproject/segmentrouting/SegmentRoutingManager.java
@@ -704,8 +704,7 @@
 
             log.trace("Rcvd pktin: {}", ethernet);
             if (ethernet.getEtherType() == TYPE_ARP) {
-                log.warn("{} - we are still receiving ARP packets from {}",
-                         context.inPacket().receivedFrom());
+                log.warn("Receive unexpected ARP packet on {}", context.inPacket().receivedFrom());
                 log.debug("{}", ethernet);
                 return;
             } else if (ethernet.getEtherType() == Ethernet.TYPE_IPV4) {