Add additional health delay

- update test_vnf to wait for ns to delete
Signed-off-by: Michael Marchetti <mmarchetti@sandvine.com>
diff --git a/systest/testcases/vnfs/test_vnfs.py b/systest/testcases/vnfs/test_vnfs.py
index 53f39ac..b84da44 100644
--- a/systest/testcases/vnfs/test_vnfs.py
+++ b/systest/testcases/vnfs/test_vnfs.py
@@ -117,6 +117,12 @@
 
             assert not osm.get_api().ns.delete(ns_name)
 
+            #wait for the ns to delete
+            try:
+                utils.wait_for_value( lambda: osm.get_api().ns.get(nsd_desc['name']), result=False, wait_time=60)
+            except:
+                pass
+
             assert not osm.get_api().nsd.delete(nsd_desc['name'])
 
         for file in vnfd_file_list: