[389-devel] Please review ticket 47823: RFE enforce attributes uniqueness over several subtrees

Ticket is https://fedorahosted.org/389/ticket/47823

Fix is https://fedorahosted.org/389/attachment/ticket/47823/0001-Ticket-47823-attribute-uniqueness-enforced-on-all-su.patch

Test case is https://fedorahosted.org/389/attachment/ticket/47823/0002-Ticket-47823-test-case-enforce-attributes-uniqueness.patch