Update runc to v1.0.0-rc91

https://github.com/opencontainers/runc/releases/tag/v1.0.0-rc91

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

vendor/github.com/opencontainers/selinux/go-selinux/label/label.go

@@ -1,8 +1,6 @@
 package label
 
 import (
-	"fmt"
-
 	"github.com/opencontainers/selinux/go-selinux"
 )
 
@@ -48,7 +46,7 @@ var PidLabel = selinux.PidLabel
 
 // Init initialises the labeling system
 func Init() {
-	_ = selinux.GetEnabled()
+	selinux.GetEnabled()
 }
 
 // ClearLabels will clear all reserved labels
@@ -77,21 +75,3 @@ func ReleaseLabel(label string) error {
 // can be used to set duplicate labels on future container processes
 // Deprecated: use selinux.DupSecOpt
 var DupSecOpt = selinux.DupSecOpt
-
-// FormatMountLabel returns a string to be used by the mount command.
-// The format of this string will be used to alter the labeling of the mountpoint.
-// The string returned is suitable to be used as the options field of the mount command.
-// If you need to have additional mount point options, you can pass them in as
-// the first parameter.  Second parameter is the label that you wish to apply
-// to all content in the mount point.
-func FormatMountLabel(src, mountLabel string) string {
-	if mountLabel != "" {
-		switch src {
-		case "":
-			src = fmt.Sprintf("context=%q", mountLabel)
-		default:
-			src = fmt.Sprintf("%s,context=%q", src, mountLabel)
-		}
-	}
-	return src
-}