remove unused discovery package

Signed-off-by: Leo Chen <leo@harmony.one>

discovery/discovery.go

@@ -1,70 +0,0 @@
-package discovery
-
-import (
-	"fmt"
-
-	"github.com/dedis/kyber"
-	"github.com/harmony-one/harmony/p2p"
-)
-
-// ConfigEntry is the config entry.
-type ConfigEntry struct {
-	IP          string
-	Port        string
-	Role        string
-	ShardID     string
-	ValidatorID int // Validator ID in its shard.
-	leader      p2p.Peer
-	self        p2p.Peer
-	peers       []p2p.Peer
-	priK        kyber.Scalar
-	pubK        kyber.Point
-}
-
-func (config ConfigEntry) String() string {
-	return fmt.Sprintf("bc: %v:%v", config.IP, config.Port)
-}
-
-// New return new ConfigEntry.
-// TODO: This should be change because this package is discovery and New here implies New Discovery.
-func New(priK kyber.Scalar, pubK kyber.Point) *ConfigEntry {
-	var config ConfigEntry
-	config.priK = priK
-	config.pubK = pubK
-
-	config.peers = make([]p2p.Peer, 0)
-
-	return &config
-}
-
-// StartClientMode starts client mode.
-func (config *ConfigEntry) StartClientMode(bcIP, bcPort string) error {
-	config.IP = "myip"
-	config.Port = "myport"
-
-	fmt.Printf("bc ip/port: %v/%v\n", bcIP, bcPort)
-
-	// ...
-	// TODO: connect to bc, and wait unless acknowledge
-	return nil
-}
-
-// GetShardID ...
-func (config *ConfigEntry) GetShardID() string {
-	return config.ShardID
-}
-
-// GetPeers ...
-func (config *ConfigEntry) GetPeers() []p2p.Peer {
-	return config.peers
-}
-
-// GetLeader ...
-func (config *ConfigEntry) GetLeader() p2p.Peer {
-	return config.leader
-}
-
-// GetSelfPeer ...
-func (config *ConfigEntry) GetSelfPeer() p2p.Peer {
-	return config.self
-}