https://fedorahosted.org/sssd/ticket/1307
When saving aliases, sdap_check_aliases tests if there is another user
with primary name as the alias being processed. It however, does not
check if it found the user himself. This can lead to errors, which are
skipped during RFC2307bis, but can break initgroups of RFC2307.
I think this is important enough to apply into 1.8