Title: #85: SYSDB: Removing of sysdb_try_to_find_expected_dn()
We need AD domain and it's AD subdomain.
If we type in SSSD box connected to AD domain:
it resolves between Administrator@<domain> and Administrator@<subdomain>
See the full comment at https://github.com/SSSD/sssd/pull/85#issuecomment-262537432