VALIDATORS: Detect inherit_from in normal domain
This patch adds new sssd specific validator. In the future we
can add more checks in it, but currently it only checks if
the option inherit_from is used on normal domain and reports
error if it is.
Resolves:
https://pagure.io/SSSD/sssd/issue/3356
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>