Code enhancements

Jenkinsfile

@@ -75,21 +75,16 @@ pipeline {
     }
     stage("Update") {
       when { expression { service_update != "" } }
-      environment {
-          DOCKER_HOST="${DHOST}"
-      }
       steps {
         script {
           for (String item : service_update.split()) {
             echo "Updating ${item}"
-            sh "set"
-            sh "DOCKER_HOST=${DHOST} docker node ls"
             try{
-               sh "docker service update ${item} --image ${DOCKER_REGISTRY}/iru/${DOCKER_IMAGE}:${NEWTAG}"
+               sh "DOCKER_HOST=${DHOST} docker service update ${item} --image ${DOCKER_REGISTRY}/iru/${DOCKER_IMAGE}:${NEWTAG}"
             }
             catch(err){
                echo "Recovering service $item"
-               sh "docker service rollback ${item}"
+               sh "DOCKER_HOST=${DHOST} docker service rollback ${item}"
                throw err
             }
           }