def _host_dhcp_opts(vif_id=None, gateway=None):
    values = []
    if vif_id is not None:
        values.append(_host_dhcp_network(vif_id))
    # NOTE(vish): 3 is the dhcp option for gateway.
    values.append('3')
    if gateway:
        values.append('%s' % gateway)
    return ','.join(values)
Determines the path to the management module for the given app_name,
dataset/ETHPy150Open openstack/nova/nova/network/linux_net.py/_host_dhcp_opts--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.2/django/core/management/__init__.py/find_management_module