'Driver for Default Object ACL. Calls helpers as needed.
return: (bool, [list of AuditIssues])'

def inspect_default_object_acl(self, item):

    def_obj_acl = item.config.get('DefaultObjectAcl')
    errors_acl = []
    if def_obj_acl:
        err = self._acl_allusers_exists(def_obj_acl, 'DEFAULT_OBJECT_ACL')
        (errors_acl.extend(err) if err else None)
        err = self._acl_max_owners(def_obj_acl, 'DEFAULT_OBJECT_ACL')
        (errors_acl.extend(err) if err else None)
        if errors_acl:
            return (False, errors_acl)
        return (True, None)
    else:
        return (False, ['DEF_OBJ_ACL_NOT_FOUND'])
