Directory Restructure (#1163)

* Move tests -> testing

* Directory restructure

* Update Cargo.toml during restructure

* Update Makefile during restructure

* Fix arbitrary path

common/validator_dir/src/lib.rs

@@ -0,0 +1,21 @@
+//! Provides:
+//!
+//! - `ValidatorDir`: manages a directory containing validator keypairs, deposit info and other
+//! things.
+//! - `Manager`: manages a directory that contains multiple `ValidatorDir`.
+//!
+//! This crate is intended to be used by the account manager to create validators and the validator
+//! client to load those validators.
+
+mod builder;
+pub mod insecure_keys;
+mod manager;
+pub mod unencrypted_keys;
+mod validator_dir;
+
+pub use crate::validator_dir::{Error, Eth1DepositData, ValidatorDir, ETH1_DEPOSIT_TX_HASH_FILE};
+pub use builder::{
+    Builder, Error as BuilderError, ETH1_DEPOSIT_DATA_FILE, VOTING_KEYSTORE_FILE,
+    WITHDRAWAL_KEYSTORE_FILE,
+};
+pub use manager::{Error as ManagerError, Manager};