'Get a list of hosts where specified DVR router should be hosted
It will first get IDs of all subnets connected to the router and then
get a set of hosts where all dvr serviceable ports on those subnets
are bound'

def _get_dvr_hosts_for_router(self, context, router_id):

    subnet_ids = self.get_subnet_ids_on_router(context, router_id)
    hosts = self._get_dvr_hosts_for_subnets(context, subnet_ids)
    LOG.debug('Hosts    for    router    %s:    %s', router_id, hosts)
    return hosts
