Use tempdir for account manager

eth2/utils/eth2_testnet/Cargo.toml

@@ -6,12 +6,10 @@ edition = "2018"
 
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
-[dev-dependencies]
-tempdir = "0.3"
-
 [dependencies]
 serde = "1.0"
 serde_yaml = "0.8"
 types = { path = "../../types"}
 eth2-libp2p = { path = "../../../beacon_node/eth2-libp2p"}
 eth2_ssz = { path = "../ssz"}
+tempdir = "0.3"

eth2/utils/eth2_testnet/src/lib.rs

@@ -14,6 +14,8 @@ use std::io::{Read, Write};
 use std::path::PathBuf;
 use types::{Address, BeaconState, EthSpec, YamlConfig};
 
+pub use tempdir::TempDir;
+
 pub const ADDRESS_FILE: &str = "deposit_contract.txt";
 pub const DEPLOY_BLOCK_FILE: &str = "deploy_block.txt";
 pub const BOOT_ENR_FILE: &str = "boot_enr.yaml";