def instance_get_all_by_host(context, host, columns_to_join=None):
 return IMPL.instance_get_all_by_host(context, host, columns_to_join)

def instance_get_all_by_host ( context , host , columns_to_join = None ) : return IMPL . instance_get_all_by_host ( context , host , columns_to_join )
get all instances belonging to a host .