Title: #275: Implement access verification by rhost using ldap_access_order rhost option
Probably, I still do not understand the problem. What do you mean by "to add new
custom field"? Because most of attributes in `src/providers/ipa/ipa_opts.c` or in
`src/providers/ad/ad_opts.c` are not part of standards rfc2307/rfc2307bis. Therefore they
have default LDAP attribute set to NULL(`def_name` in `struct sdap_attr_map`) for these
providers (arrays `rfc2307_group_map`, `rfc2307bis_group_map`)
If previous explanation does not help could you a little bit elaborate?
See the full comment at https://github.com/SSSD/sssd/pull/275#issuecomment-312617227