Move metrics into its own crate

tests/multinode.rs

@@ -26,10 +26,10 @@ use solana::service::Service;
 use solana::signature::{Keypair, KeypairUtil};
 use solana::system_transaction::SystemTransaction;
 use solana::thin_client::{retry_get_balance, ThinClient};
-use solana::timing::{duration_as_ms, duration_as_s};
 use solana::transaction::Transaction;
 use solana::window::default_window;
 use solana_sdk::pubkey::Pubkey;
+use solana_sdk::timing::{duration_as_ms, duration_as_s};
 use std::collections::{HashSet, VecDeque};
 use std::env;
 use std::fs::{copy, create_dir_all, remove_dir_all};