update to use containerd seccomp package

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/containerd/continuity/fs/du.go

@@ -1,22 +0,0 @@
-package fs
-
-import "context"
-
-// Usage of disk information
-type Usage struct {
-	Inodes int64
-	Size   int64
-}
-
-// DiskUsage counts the number of inodes and disk usage for the resources under
-// path.
-func DiskUsage(roots ...string) (Usage, error) {
-	return diskUsage(roots...)
-}
-
-// DiffUsage counts the numbers of inodes and disk usage in the
-// diff between the 2 directories. The first path is intended
-// as the base directory and the second as the changed directory.
-func DiffUsage(ctx context.Context, a, b string) (Usage, error) {
-	return diffUsage(ctx, a, b)
-}