Move ActionManager to its own file

Bug: 36970783
Test: build
Change-Id: I08fa39052236b462249f79de1d02bf02bdbf4c84
diff --git a/init/init.h b/init/init.h
index ff7bdeb..ecce5d7 100644
--- a/init/init.h
+++ b/init/init.h
@@ -21,6 +21,7 @@
 #include <vector>
 
 #include "action.h"
+#include "action_manager.h"
 #include "parser.h"
 #include "service.h"