Refactoring in pipelines to better use salt.groovy lib code

Change-Id: I2643dcdff287384aa623900b7f4b131531d85f49
diff --git a/cicd-lab-pipeline.groovy b/cicd-lab-pipeline.groovy
index 6236f2a..da3e177 100644
--- a/cicd-lab-pipeline.groovy
+++ b/cicd-lab-pipeline.groovy
@@ -181,7 +181,7 @@
                 }
                 // XXX: Workaround to have `/var/lib/jenkins` on all
                 // nodes where are jenkins_slave services are created.
-                salt.runSaltProcessStep(pepperEnv, 'I@docker:swarm', 'cmd.run', ['mkdir -p /var/lib/jenkins'])
+                salt.cmdRun(pepperEnv, 'I@docker:swarm', "mkdir -p /var/lib/jenkins")
             }
 
             stage("Configure CI/CD services") {