workflow app fixes

Change-Id: Ia3b06b7947671e4e38ca37eb832e6a969ed1e6af
diff --git a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workflow.java b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workflow.java
index 96e623f..848a706 100644
--- a/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workflow.java
+++ b/apps/workflow/api/src/main/java/org/onosproject/workflow/api/Workflow.java
@@ -16,6 +16,7 @@
 package org.onosproject.workflow.api;
 
 import java.net.URI;
+import java.util.List;
 import java.util.Set;
 
 /**
@@ -84,4 +85,10 @@
      * @return attributes
      */
     Set<WorkflowAttribute> attributes();
+
+    /**
+     * Returns worklet type list.
+     * @return worklet type
+     */
+    List<String> getWorkletTypeList();
 }