SERVER_MODE: Update sdap lists for each ad_ctx
We use separate AD context for each subdomain in the server mode.
Every such context has it's own sdap_domain list witch represents
sdap options such as filter and search bases for every domain.
However AD context can only fully initialize sdap_domain structure
for the same domain for which the whole context was created, which
resulted in the other sdap_domain structures to be have automaticily
detected settings. This can cause problems if user is member of
groups from multiple domains.
Resolves:
https://pagure.io/SSSD/sssd/issue/3381
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>