Reduce libvirt node names lenght for cookiecutter-context-k8s-sl

Don't add domain name to the libvirt node names, to fit into
path lenght for the qemu monitor socket (108 chars including zero)

Change-Id: I13ab5f7398debbb5984c3eb8f42df28049a60944
diff --git a/jobs/pipelines/swarm-bootstrap-salt-cluster-devops.groovy b/jobs/pipelines/swarm-bootstrap-salt-cluster-devops.groovy
index 024bd83..135f9d5 100644
--- a/jobs/pipelines/swarm-bootstrap-salt-cluster-devops.groovy
+++ b/jobs/pipelines/swarm-bootstrap-salt-cluster-devops.groovy
@@ -71,8 +71,10 @@
 
             stage("Upload generated config drive ISO into volume on cfg01 node") {
                 shared.run_cmd("""\
-                virsh vol-upload ${ENV_NAME}_cfg01.${LAB_CONFIG_NAME}.local_config /home/jenkins/images/${CFG01_CONFIG_IMAGE_NAME} --pool default
-                virsh pool-refresh --pool default
+                    # Get SALT_MASTER_HOSTNAME to determine the volume name
+                    . ./tcp_tests/utils/env_salt
+                    virsh vol-upload ${ENV_NAME}_\${SALT_MASTER_HOSTNAME}_config /home/jenkins/images/${CFG01_CONFIG_IMAGE_NAME} --pool default
+                    virsh pool-refresh --pool default
                 """)
             }