Refactoring to move code to right locations. Attempt at breaking dependency cycles.
diff --git a/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/MastershipBasedTimestampSerializer.java b/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/MastershipBasedTimestampSerializer.java
new file mode 100644
index 0000000..99b4f95
--- /dev/null
+++ b/core/store/dist/src/main/java/org/onlab/onos/store/common/impl/MastershipBasedTimestampSerializer.java
@@ -0,0 +1,34 @@
+package org.onlab.onos.store.common.impl;
+
+import com.esotericsoftware.kryo.Kryo;
+import com.esotericsoftware.kryo.Serializer;
+import com.esotericsoftware.kryo.io.Input;
+import com.esotericsoftware.kryo.io.Output;
+
+// To be used if Timestamp ever needs to cross bundle boundary.
+/**
+ * Kryo Serializer for {@link DeviceMastershipBasedTimestamp}.
+ */
+public class MastershipBasedTimestampSerializer extends Serializer<DeviceMastershipBasedTimestamp> {
+
+    /**
+     * Creates a serializer for {@link DeviceMastershipBasedTimestamp}.
+     */
+    public MastershipBasedTimestampSerializer() {
+        // non-null, immutable
+        super(false, true);
+    }
+
+    @Override
+    public void write(Kryo kryo, Output output, DeviceMastershipBasedTimestamp object) {
+        output.writeInt(object.termNumber());
+        output.writeInt(object.sequenceNumber());
+    }
+
+    @Override
+    public DeviceMastershipBasedTimestamp read(Kryo kryo, Input input, Class<DeviceMastershipBasedTimestamp> type) {
+        final int term = input.readInt();
+        final int sequence = input.readInt();
+        return new DeviceMastershipBasedTimestamp(term, sequence);
+    }
+}