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

beacon_node/db/src/stores/mod.rs

@@ -1,25 +0,0 @@
-use super::{ClientDB, DBError};
-
-#[macro_use]
-mod macros;
-mod beacon_block_store;
-mod beacon_state_store;
-mod pow_chain_store;
-mod validator_store;
-
-pub use self::beacon_block_store::{BeaconBlockAtSlotError, BeaconBlockStore};
-pub use self::beacon_state_store::BeaconStateStore;
-pub use self::pow_chain_store::PoWChainStore;
-pub use self::validator_store::{ValidatorStore, ValidatorStoreError};
-
-pub const BLOCKS_DB_COLUMN: &str = "blocks";
-pub const STATES_DB_COLUMN: &str = "states";
-pub const POW_CHAIN_DB_COLUMN: &str = "powchain";
-pub const VALIDATOR_DB_COLUMN: &str = "validator";
-
-pub const COLUMNS: [&str; 4] = [
-    BLOCKS_DB_COLUMN,
-    STATES_DB_COLUMN,
-    POW_CHAIN_DB_COLUMN,
-    VALIDATOR_DB_COLUMN,
-];