description in confd-guide:
Instructs the CLI engine to generate a no-commnd before modifying an existing instance. It only applies
when generating diffs, eg 'show configuration' in C-style.
The cli-remove-before-change statement can be used in: leaf-list, list, leaf, tailf:symlink, and refine.
This label only applies when generating diffs, is there have some label not only apply when generating diffs, but also sending "delete operation" to deamn and then sending "create operation" to deamn when modify a leaf?