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/duties/grpc.rs

@@ -1,54 +0,0 @@
-use super::traits::{BeaconNode, BeaconNodeError};
-use super::EpochDuties;
-use protos::services::{ProposeBlockSlotRequest, PublicKey as IndexRequest};
-use protos::services_grpc::ValidatorServiceClient;
-use ssz::ssz_encode;
-use types::{Epoch, PublicKey, Slot};
-
-impl BeaconNode for ValidatorServiceClient {
-    /// Request the shuffling from the Beacon Node (BN).
-    ///
-    /// As this function takes a `PublicKey`, it will first attempt to resolve the public key into
-    /// a validator index, then call the BN for production/attestation duties.
-    ///
-    /// Note: presently only block production information is returned.
-    fn request_shuffling(
-        &self,
-        epoch: Epoch,
-        public_key: &PublicKey,
-    ) -> Result<Option<EpochDuties>, BeaconNodeError> {
-        // Lookup the validator index for the supplied public key.
-        let validator_index = {
-            let mut req = IndexRequest::new();
-            req.set_public_key(ssz_encode(public_key).to_vec());
-            let resp = self
-                .validator_index(&req)
-                .map_err(|err| BeaconNodeError::RemoteFailure(format!("{:?}", err)))?;
-            resp.get_index()
-        };
-
-        let mut req = ProposeBlockSlotRequest::new();
-        req.set_validator_index(validator_index);
-        req.set_epoch(epoch.as_u64());
-
-        let reply = self
-            .propose_block_slot(&req)
-            .map_err(|err| BeaconNodeError::RemoteFailure(format!("{:?}", err)))?;
-
-        let block_production_slot = if reply.has_slot() {
-            Some(reply.get_slot())
-        } else {
-            None
-        };
-
-        let block_production_slot = match block_production_slot {
-            Some(slot) => Some(Slot::new(slot)),
-            None => None,
-        };
-
-        Ok(Some(EpochDuties {
-            validator_index,
-            block_production_slot,
-        }))
-    }
-}