When retrieving keytab, it is useful to know what user was attempting to fetch the keyts and failed. This is useful to debug one-way trust where SSSD forks out a process of ipa-getkeytab and it might be using a wrong credentials cache for authentication purposes. Part of https://fedorahosted.org/freeipa/ticket/4959 Reviewed-By: Tomas Babej <tbabej@redhat.com>
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