Add refint support to user rename.

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When refint is enabled on an LDAP server, it will rename all references
to an entity if its DN is modified. If this happens, the member
renames will not be needed, and will also return an error.

This PR does the following:

* Detects the attribute error, and don't return an error.
* Log that the server has been misconfigured.
* Add config value that skips renaming if set.

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