Skeletons for Intent-runtime, Flow-manager and Match-action modules.

This task is a part of ONOS-1395.
(Sub-tasks: ONOS-1397, ONOS-1398, ONOS-1400)

Change-Id: I30064f658b6c193aee8419079dad380163364475
diff --git a/src/main/java/net/onrc/onos/core/matchaction/action/IAction.java b/src/main/java/net/onrc/onos/core/matchaction/action/IAction.java
new file mode 100644
index 0000000..b381f85
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/matchaction/action/IAction.java
@@ -0,0 +1,8 @@
+package net.onrc.onos.core.matchaction.action;
+
+/**
+ * An interface of action objects.
+ */
+public interface IAction {
+
+}