Remove redundant imports from TimestampedTest
diff --git a/core/store/dist/src/test/java/org/onlab/onos/store/impl/TimestampedTest.java b/core/store/dist/src/test/java/org/onlab/onos/store/impl/TimestampedTest.java
index e66fbe4..3e7fec2 100644
--- a/core/store/dist/src/test/java/org/onlab/onos/store/impl/TimestampedTest.java
+++ b/core/store/dist/src/test/java/org/onlab/onos/store/impl/TimestampedTest.java
@@ -6,8 +6,6 @@
 
 import org.junit.Test;
 import org.onlab.onos.store.Timestamp;
-import org.onlab.onos.store.impl.MastershipBasedTimestamp;
-import org.onlab.onos.store.impl.Timestamped;
 import org.onlab.util.KryoPool;
 
 import com.google.common.testing.EqualsTester;