Add lab-build snippets and executing them in 'create'. Refactor create/destroy/pristine; also, only virsh destroy VMs if they are 'running'

destroy

@@ -10,13 +10,17 @@
 ##     *  Recursively delete any matching ZFS datasets
 
 BASE=${BASE:=ssd-vol0/hvn0.chbtl0.ipng.ch/ssd-vol0/vpp-proto-disk0@20221018-release}
+BUILD=${BUILD:=default}
 LAB=${LAB:=0}
 
 ## Do not touch below this line
 HVN="hvn${LAB}.lab.ipng.ch"
 
-echo "*  Destroying VMs"
-ssh root@$HVN "set -x; for node in 0 1 2 3; do VM=vpp${LAB}-\${node}; virsh destroy \$VM; done"
+VMS=$(ls -1 build/${BUILD}/${HVN}/)
 
-echo "*  Destroying ZFS datasets"
-ssh root@$HVN "set -x; for node in 0 1 2 3; do VM=vpp${LAB}-\${node}; zfs destroy -r ssd-vol0/\$VM; done"
+for VM in $VMS; do
+  echo "[$VM] Destroying VM"
+  ssh root@$HVN "/usr/bin/virsh list --all | grep $VM.*running >/dev/null && virsh destroy $VM"
+  echo "[$VM] Destroying ZFS datasets"
+  ssh root@$HVN "zfs destroy -r ssd-vol0/$VM"
+done