moved Timestamped to appropriate package

Change-Id: I5cb9385b9bb84c0942014dd69654cfbce97db77b
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java
index a04539b..114150f 100644
--- a/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/serializers/DistributedStoreSerializers.java
@@ -1,7 +1,7 @@
 package org.onlab.onos.store.serializers;
 
-import org.onlab.onos.store.common.impl.Timestamped;
 import org.onlab.onos.store.impl.MastershipBasedTimestamp;
+import org.onlab.onos.store.impl.Timestamped;
 import org.onlab.onos.store.impl.WallClockTimestamp;
 import org.onlab.util.KryoPool;