Since no kernels support direct labeling of /dev/mqueue remove label

This looks like this is just filling logs for years, since the kernel never
added the support for automatically labeling /dev/mqueue.

Removes these dmesg lines

[ 1731.969847] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1736.985146] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1738.356796] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1738.479952] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1738.628935] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1763.433276] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1806.802133] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1806.982003] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1808.955390] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1815.951076] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1827.257757] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1828.947888] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1834.964451] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)
[ 1835.941465] SELinux: mount invalid.  Same superblock, different security settings for (dev mqueue, type mqueue)

Signed-off-by: Daniel J Walsh <[email protected]>

Author: rhatdan

libcontainer/rootfs_linux.go

@@ -329,14 +329,10 @@ func mountToRootfs(m *configs.Mount, rootfs, mountLabel string, enableCgroupns b
 		if err := os.MkdirAll(dest, 0755); err != nil {
 			return err
 		}
-		if err := mountPropagate(m, rootfs, mountLabel); err != nil {
-			// older kernels do not support labeling of /dev/mqueue
-			if err := mountPropagate(m, rootfs, ""); err != nil {
-				return err
-			}
-			return label.SetFileLabel(dest, mountLabel)
+		if err := mountPropagate(m, rootfs, ""); err != nil {
+			return err
 		}
-		return nil
+		return label.SetFileLabel(dest, mountLabel)
 	case "tmpfs":
 		copyUp := m.Extensions&configs.EXT_COPYUP == configs.EXT_COPYUP
 		tmpDir := ""