Strip out old code

All of these files have been moved to either:

- https://github.com/sigp/lighthouse-beacon
- https://github.com/sigp/lighthouse-validator
- https://github.com/sigp/lighthouse-common

For rationale, see: https://github.com/sigp/lighthouse/issues/197

validator_client/src/config.rs

@@ -1,25 +0,0 @@
-use std::fs;
-use std::path::PathBuf;
-
-/// Stores the core configuration for this validator instance.
-#[derive(Clone)]
-pub struct ClientConfig {
-    pub data_dir: PathBuf,
-    pub server: String,
-}
-
-const DEFAULT_LIGHTHOUSE_DIR: &str = ".lighthouse-validators";
-
-impl ClientConfig {
-    /// Build a new configuration from defaults.
-    pub fn default() -> Self {
-        let data_dir = {
-            let home = dirs::home_dir().expect("Unable to determine home dir.");
-            home.join(DEFAULT_LIGHTHOUSE_DIR)
-        };
-        fs::create_dir_all(&data_dir)
-            .unwrap_or_else(|_| panic!("Unable to create {:?}", &data_dir));
-        let server = "localhost:50051".to_string();
-        Self { data_dir, server }
-    }
-}