etcd3locker: Update import path for etcd3

pkg/etcd3locker/lock.go

@@ -7,7 +7,7 @@ import (
 	"time"
 
 	"github.com/tus/tusd/pkg/handler"
-	"go.etcd.io/etcd/clientv3/concurrency"
+	"github.com/coreos/etcd/clientv3/concurrency"
 )
 
 type etcd3Lock struct {

pkg/etcd3locker/locker.go

@@ -48,8 +48,8 @@ import (
 	"time"
 
 	"github.com/tus/tusd/pkg/handler"
-	etcd3 "go.etcd.io/etcd/clientv3"
-	"go.etcd.io/etcd/clientv3/concurrency"
+	etcd3 "github.com/coreos/etcd/clientv3"
+	"github.com/coreos/etcd/clientv3/concurrency"
 )
 
 var (

pkg/etcd3locker/locker_test.go

@@ -2,7 +2,7 @@ package etcd3locker
 
 import (
 	etcd_harness "github.com/chen-anders/go-etcd-harness"
-	"go.etcd.io/etcd/clientv3"
+	"github.com/coreos/etcd/clientv3"
 	"os"
 	"testing"
 	"time"