Function libzt::zts_addr_is_assigned

pub unsafe extern "C" fn zts_addr_is_assigned(
    net_id: u64, 
    family: c_uint
) -> c_int

@brief Return whether an address of the given family has been assigned by the network

@param net_id Network ID @param family ZTS_AF_INET, or ZTS_AF_INET6 @return 1 if true, 0 if false.