moved Timestamped to appropriate package

Change-Id: I5cb9385b9bb84c0942014dd69654cfbce97db77b
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java
index 03c293a..43008d2 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/device/impl/DeviceDescriptions.java
@@ -15,7 +15,7 @@
 import org.onlab.onos.net.device.DeviceDescription;
 import org.onlab.onos.net.device.PortDescription;
 import org.onlab.onos.store.Timestamp;
-import org.onlab.onos.store.common.impl.Timestamped;
+import org.onlab.onos.store.impl.Timestamped;
 
 /*
  * Collection of Description of a Device and Ports, given from a Provider.