SYSDB: Add methods to deal with the domain's resolution order In the following-up patches those newly introduced methods will be used to deal with the domainResolutionOrder attribute. The sysdb_update_domain_resolution_order() method is purposely not checking whether a value has changed or not before writing to sysdb and while may not be optimal, the readability of the code has increased a lot by keeping it as simple as possible. Tests for these new methods are part of the next commit. Related: https://pagure.io/SSSD/sssd/issue/3001 Signed-off-by: Fabiano Fidêncio <fidencio@redhat.com> Reviewed-by: Sumit Bose <sbose@redhat.com> Reviewed-by: Pavel Březina <pbrezina@redhat.com>