This change introduces a new CLI tool that can be used to set and
reset the password of all the built-in users and users in the native
realm in Elasticsearch. It depends on the file realm being enabled
(which it is, by default) and can (re)set one built-in user password at a time.
It removes the previously introduced elasticsearch-reset-elastic-password
and elasticsearch-reset-kibana-system-password as their functionality is
covered by this new tool.
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