Code enhancements

Jenkinsfile

@@ -83,12 +83,12 @@ pipeline {
           for (String item : service_update.split()) {
             try{
                echo "Updating ${item}"
-               sh "set"
+               sh "docker node ls"
                sh "docker service update ${item} --image ${DOCKER_REGISTRY}/iru/${DOCKER_IMAGE}:${NEWTAG}"
             }
             catch(err){
                echo "Recovering service $item"
-               sh "DOCKER_HOST=$DOCKER_HOST DOCKER_CERT_PATH=$DOCKER_CERT_PATH docker service rollback ${item}"
+               sh "docker service rollback ${item}"
                throw err
             }
           }