message: use a better template for temp files.
diff: @@ -82,7 +82,8 @@ EOF
  echo "copy ${PVC} to storage"
  ${OC} exec $MIGRATOR -- cp -Rpav /storage/${PVC} /migrator/
  - TMP=$(mktemp temp.${PVC}.json)
  + TMP=$(mktemp temp.${PVC}.json.XXXX)
  +
  echo "dumping pvc ${PVC} to ${TMP}."
  ${OC} get -o json pvc/${PVC} --export=true | jq 'del(.metadata.annotations, .metadata.selfLink, .spec.volumeName, .status)' > $TMP
  