Updated NS deletion time to test_vnfs used in stage4

Change-Id: I5e699b6038990af913dacfa3a54238e0f4bedc98
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>

systest/testcases/vnfs/test_vnfs.py

@@ -119,7 +119,7 @@ class TestClass(object):
 
             #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)
+                utils.wait_for_value( lambda: osm.get_api().ns.get(nsd_desc['name']), result=False, wait_time=180)
             except:
                 pass