[VOL-4138] updating to ONOS 2.5.2-SNAPSHOT dependencies

Change-Id: I49f0543d213bbd4af373cc0bbc5c2cd9c8033b5a
diff --git a/impl/src/main/java/org/opencord/olt/impl/OltFlowService.java b/impl/src/main/java/org/opencord/olt/impl/OltFlowService.java
index 83919a4..466d363 100644
--- a/impl/src/main/java/org/opencord/olt/impl/OltFlowService.java
+++ b/impl/src/main/java/org/opencord/olt/impl/OltFlowService.java
@@ -67,8 +67,8 @@
 import org.slf4j.Logger;
 
 import java.util.Dictionary;
-import java.util.Optional;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Properties;
 import java.util.concurrent.BlockingQueue;
 import java.util.concurrent.CompletableFuture;