remove import (#3550)

Author: jkrauska

src/codanet.go

@@ -9,7 +9,6 @@ import (
 	p2p "github.com/libp2p/go-libp2p"
 	crypto "github.com/libp2p/go-libp2p-core/crypto"
 	host "github.com/libp2p/go-libp2p-core/host"
-	"github.com/libp2p/go-libp2p-core/network"
 	"github.com/libp2p/go-libp2p-core/peer"
 	routing "github.com/libp2p/go-libp2p-core/routing"
 	discovery "github.com/libp2p/go-libp2p-discovery"