Fix the renaming of metadata pkg

Fix #FAB-1487

Change-Id: I394078c4186a4c87b95b0177576eb2009b47c027
Signed-off-by: Baohua Yang <[email protected]>

Author: yeasy

core/util/utils.go

@@ -25,7 +25,7 @@ import (
 	"strings"
 	"time"
 
-	"github.com/hyperledger/fabric/metadata"
+	"github.com/hyperledger/fabric/common/metadata"
 
 	"github.com/golang/protobuf/ptypes/timestamp"
 	"golang.org/x/crypto/sha3"