integration: don't set v3 capability since now default

integration/cluster.go

@@ -37,7 +37,6 @@ import (
 	"github.com/coreos/etcd/client"
 	"github.com/coreos/etcd/clientv3"
 	"github.com/coreos/etcd/etcdserver"
-	"github.com/coreos/etcd/etcdserver/api"
 	"github.com/coreos/etcd/etcdserver/api/v2http"
 	"github.com/coreos/etcd/etcdserver/api/v3rpc"
 	pb "github.com/coreos/etcd/etcdserver/etcdserverpb"
@@ -89,11 +88,6 @@ type cluster struct {
 	Members []*member
 }
 
-func init() {
-	// manually enable v3 capability since we know the cluster members all support v3.
-	api.EnableCapability(api.V3rpcCapability)
-}
-
 func schemeFromTLSInfo(tls *transport.TLSInfo) string {
 	if tls == nil {
 		return UrlScheme