Set default value for KEEP_POD to false

KEEP_POD is used to determine the if the -p flag was used for on demand
pod persistence. Set the default value to false since single commands like
'dbutils cleanup' fail without the proper default value.

Change-Id: I27b3040ed572faf71d07411be255fbdeefe871fe

charts/etcdctl-utility/templates/bin/utility/_dbutils.tpl

@@ -307,6 +307,7 @@ function main() {
   export ONDEMAND_JOB="etcd-ondemand"
   # Save a backup of NODE if needed later
   export NODE_BACKUP="$NODE"
+  export KEEP_POD="false"
 
   # If no arguments are passed, enter interactive mode
   if [[ "${#ARGS[@]}" -eq 0 ]]; then