ece345a AD: Set ignore_mark_offline=false when resolving AD root domain

Authored and Committed by jhrozek 5 years ago
    AD: Set ignore_mark_offline=false when resolving AD root domain
    
    https://fedorahosted.org/sssd/ticket/2637
    
    Avoid going offline in cases where SSSD is connected to a child domain
    but the root domain is not accessible.
    
    Reviewed-by: Pavel Březina <pbrezina@redhat.com>