Do not run trust upgrade code if master lacks Samba bindings
    
    If a replica has no Samba bindings but there are trust agreements
    configured on some trust controller, skip trust upgrade code on this
    replica.
    
    Resolves: https://pagure.io/freeipa/issue/8001
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Thomas Woerner <twoerner@redhat.com>