takes the max of config_count and number of instances running
    with this stack/descriptor combo

def count_to_deploy(stack, descriptor, config_count):
    """
    takes the max of config_count and number of instances running
    with this stack/descriptor combo
    """
    live_count = count_by_tag(stack, descriptor)
    if config_count > live_count:
        live_count = config_count

    return live_count