'Creates a group.
:param context: the context of the caller.
:param group: the group object.
:returns: model_update
ScaleIO won\'t create CG until cg-snapshot creation,
db will maintain the volumes and CG relationship.'

def create_group(self, context, group):

    if (not volume_utils.is_group_a_cg_snapshot_type(group)):
        raise NotImplementedError()
    LOG.info('Creating    Group')
    model_update = {'status': fields.GroupStatus.AVAILABLE}
    return model_update
