Bumping ONOS to use onos-yang-tools 1.12.0-b8 version.

Change-Id: I0c5592cc318af439a6657c9b7faad261b9532848
diff --git a/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java b/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java
index 256b3a3..1ad10fd 100644
--- a/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java
+++ b/apps/restconf/restconfmgr/src/main/java/org/onosproject/restconf/restconfmanager/RestconfManager.java
@@ -38,7 +38,7 @@
 import org.onosproject.yang.model.ResourceData;
 import org.onosproject.yang.model.ResourceId;
 import org.onosproject.yang.model.SchemaId;
-import org.onosproject.yang.runtime.DefaultResourceData;
+import org.onosproject.yang.model.DefaultResourceData;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;