fix import paths for v2 release

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

sync/lock/etcd/etcd.go

@@ -11,7 +11,7 @@ import (
 
 	client "github.com/coreos/etcd/clientv3"
 	cc "github.com/coreos/etcd/clientv3/concurrency"
-	"github.com/micro/go-micro/sync/lock"
+	"github.com/micro/go-micro/v2/sync/lock"
 )
 
 type etcdLock struct {

sync/lock/http/http.go

@@ -11,7 +11,7 @@ import (
 	"path/filepath"
 	"strings"
 
-	"github.com/micro/go-micro/sync/lock"
+	"github.com/micro/go-micro/v2/sync/lock"
 )
 
 var (

sync/lock/http/server/server.go

@@ -4,8 +4,8 @@ package server
 import (
 	"net/http"
 
-	"github.com/micro/go-micro/sync/lock"
-	lkhttp "github.com/micro/go-micro/sync/lock/http"
+	"github.com/micro/go-micro/v2/sync/lock"
+	lkhttp "github.com/micro/go-micro/v2/sync/lock/http"
 )
 
 func Handler(lk lock.Lock) http.Handler {

sync/lock/memory/memory.go

@@ -5,7 +5,7 @@ import (
 	"sync"
 	"time"
 
-	lock "github.com/micro/go-micro/sync/lock"
+	lock "github.com/micro/go-micro/v2/sync/lock"
 )
 
 type memoryLock struct {