Remove use of Guava's deprecated toStringHelper

Change-Id: I264afc337a9f325a23f988a6349a74451910e7d0
diff --git a/utils/jdvue/src/main/java/org/onlab/jdvue/JavaSource.java b/utils/jdvue/src/main/java/org/onlab/jdvue/JavaSource.java
index 6902d22..8919a13 100644
--- a/utils/jdvue/src/main/java/org/onlab/jdvue/JavaSource.java
+++ b/utils/jdvue/src/main/java/org/onlab/jdvue/JavaSource.java
@@ -2,7 +2,7 @@
 
 import java.util.*;
 
-import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.MoreObjects.toStringHelper;
 
 /**
  * Simple abstraction of a Java source file for the purpose of tracking