Clean up artifacts variables in hack scripts

hack/lib/etcd.sh

@@ -70,8 +70,8 @@ kube::etcd::start() {
 
   # Start etcd
   ETCD_DIR=${ETCD_DIR:-$(mktemp -d 2>/dev/null || mktemp -d -t test-etcd.XXXXXX)}
-  if [[ -d "${ARTIFACTS_DIR:-}" ]]; then
-    ETCD_LOGFILE="${ARTIFACTS_DIR}/etcd.$(uname -n).$(id -un).log.DEBUG.$(date +%Y%m%d-%H%M%S).$$"
+  if [[ -d "${ARTIFACTS:-}" ]]; then
+    ETCD_LOGFILE="${ARTIFACTS}/etcd.$(uname -n).$(id -un).log.DEBUG.$(date +%Y%m%d-%H%M%S).$$"
   else
     ETCD_LOGFILE=${ETCD_LOGFILE:-"/dev/null"}
   fi