[SSSD] [PATCH] Do not throw a DP error when failing to delete a nonexistent user

[Stephen Gallagher]

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When processing a request for a nonexistent user, we were returning a DP
error when sysdb_delete_user() or sysdb_delete_group() returned ENOENT.

- -- 
Stephen Gallagher
RHCE 804006346421761

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