fix salt method call in mk/Openstack

Change-Id: Iad3d40e8e7b585489ddf8ff133bec7baa0bfe24c
diff --git a/src/com/mirantis/mk/Openstack.groovy b/src/com/mirantis/mk/Openstack.groovy
index 1105dc5..b9d0a16 100644
--- a/src/com/mirantis/mk/Openstack.groovy
+++ b/src/com/mirantis/mk/Openstack.groovy
@@ -387,7 +387,7 @@
         def servicesList = outputServicesStr.tokenize("\n")
         for (name in servicesList) {
             if (!name.contains('Salt command')) {
-                runSaltProcessStep(env, "${target}*", 'service.stop', ["${name}"])
+                salt.runSaltProcessStep(env, "${target}*", 'service.stop', ["${name}"])
             }
         }
     }