Drop uniqueMember mapping with nss-pam-ldapd.
    
    nss-pam-ldapd in 0.8.4 changed the default to map uniqueMember to
    member so it is no longer needed in the config file, and in fact
    causes an error to be raised.
    
    Add a Conflicts on older versions.
    
    https://fedorahosted.org/freeipa/ticket/3589