SDAP: Add option to disable use of Token-Groups
Disabling use of Token-Groups is mandatory if expansion of nested groups is not
desired (ldap_group_nesting_level = 0) for AD provider.
Resolves:
https://fedorahosted.org/sssd/ticket/2294
Reviewed-by: Lukáš Slebodník <lslebodn@redhat.com>
Reviewed-by: Jakub Hrozek <jhrozek@redhat.com>