[389-devel] Please review (2nd) 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/47823/0002-Ticket-47823-attribute-uniqueness-enforced-on-all-su.patch
Taking into account Rich review:

• use of (Slapi_DN *) rather that (char *)
• slapi_ch_free_string rather than slapi_ch_free for (char * strings)
  

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