Added simple link manager implementation.
Added link admin stuff; unit tests to come.
diff --git a/net/api/src/main/java/org/onlab/onos/net/DefaultDevice.java b/net/api/src/main/java/org/onlab/onos/net/DefaultDevice.java
index 8b4591c..69c10b7 100644
--- a/net/api/src/main/java/org/onlab/onos/net/DefaultDevice.java
+++ b/net/api/src/main/java/org/onlab/onos/net/DefaultDevice.java
@@ -4,7 +4,7 @@
 
 import java.util.Objects;
 
-import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.MoreObjects.toStringHelper;
 
 /**
  * Default infrastructure device model implementation.