Function bitceptron_regtest_utils::spawn_regtest

pub fn spawn_regtest(
    bitcoind_path: &str,
    bitcoin_conf_path: &str,
    temp_path: &str,
    regtest_confs: Vec<RegtestConf>,
    respite_period_milisecs: u64,
    connection_respite_factor: u64
) -> Result<Vec<Client>, RegtestUtilsError>