Revert "Refactoring to move code to right locations. Attempt at breaking dependency cycles."

This reverts commit 58819b4dcc697f63872bee9f3ddd41a0c4d8fca5.
diff --git a/core/api/src/main/java/org/onlab/onos/cluster/MastershipStoreDelegate.java b/core/api/src/main/java/org/onlab/onos/cluster/MastershipStoreDelegate.java
new file mode 100644
index 0000000..b4d923c
--- /dev/null
+++ b/core/api/src/main/java/org/onlab/onos/cluster/MastershipStoreDelegate.java
@@ -0,0 +1,9 @@
+package org.onlab.onos.cluster;
+
+import org.onlab.onos.store.StoreDelegate;
+
+/**
+ * Mastership store delegate abstraction.
+ */
+public interface MastershipStoreDelegate extends StoreDelegate<MastershipEvent> {
+}