Add unit test of openstack node REST API

Change-Id: I114dcec0558b450cc0fd5683cca91ee07ee8e733
diff --git a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/web/OpenstackNodeWebResource.java b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/web/OpenstackNodeWebResource.java
index e960d4b..e0f6e53 100644
--- a/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/web/OpenstackNodeWebResource.java
+++ b/apps/openstacknode/app/src/main/java/org/onosproject/openstacknode/web/OpenstackNodeWebResource.java
@@ -19,7 +19,6 @@
 import com.fasterxml.jackson.databind.node.ArrayNode;
 import com.fasterxml.jackson.databind.node.ObjectNode;
 import com.google.common.collect.Sets;
-import org.onlab.osgi.DefaultServiceDirectory;
 import org.onosproject.openstacknode.api.OpenstackNode;
 import org.onosproject.openstacknode.api.OpenstackNodeAdminService;
 import org.onosproject.openstacknode.api.OpenstackNodeService;
@@ -60,9 +59,9 @@
     private static final String DELETE = "DELETE";
 
     private final OpenstackNodeAdminService osNodeAdminService =
-            DefaultServiceDirectory.getService(OpenstackNodeAdminService.class);
+                                            get(OpenstackNodeAdminService.class);
     private final OpenstackNodeService osNodeService =
-            DefaultServiceDirectory.getService(OpenstackNodeService.class);
+                                            get(OpenstackNodeService.class);
 
     @Context
     private UriInfo uriInfo;