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/provider/ProviderId.java b/net/api/src/main/java/org/onlab/onos/net/provider/ProviderId.java
index 3af20ad..a945354 100644
--- a/net/api/src/main/java/org/onlab/onos/net/provider/ProviderId.java
+++ b/net/api/src/main/java/org/onlab/onos/net/provider/ProviderId.java
@@ -2,7 +2,7 @@
 
 import java.util.Objects;
 
-import static com.google.common.base.Objects.toStringHelper;
+import static com.google.common.base.MoreObjects.toStringHelper;
 
 /**
  * Notion of provider identity.