Refactor NoAction class

- Move from inner class to core.matchaction.action package
- Rename from NoAction to NullAction
- Make NullAction singleton

Change-Id: I0a41c7ef984492f2b293a6df27479a4cca68a5f9
diff --git a/src/main/java/net/onrc/onos/core/matchaction/action/Actions.java b/src/main/java/net/onrc/onos/core/matchaction/action/Actions.java
new file mode 100644
index 0000000..c69f871
--- /dev/null
+++ b/src/main/java/net/onrc/onos/core/matchaction/action/Actions.java
@@ -0,0 +1,19 @@
+package net.onrc.onos.core.matchaction.action;
+
+/**
+ * Utility for creating an instance of action.
+ */
+public final class Actions {
+    private Actions() {}
+
+    // TODO: consider if it is meaningful to return NullAction
+    // instead of just Action
+    /**
+     * Returns an action representing null action.
+     *
+     * @return action representing null action
+     */
+    public static NullAction nullAction() {
+        return NullAction.getInstance();
+    }
+}