Update vendor dependencies

Change-Id: I3b1ca9f2687388c831d9d46a4e1de413ffae06ac

vendor/github.com/karrick/godirwalk/dirent.go

@@ -0,0 +1,74 @@
+package godirwalk
+
+import (
+	"os"
+	"path/filepath"
+
+	"github.com/pkg/errors"
+)
+
+// Dirent stores the name and file system mode type of discovered file system
+// entries.
+type Dirent struct {
+	name     string
+	modeType os.FileMode
+}
+
+// NewDirent returns a newly initialized Dirent structure, or an error. This
+// function does not follow symbolic links.
+//
+// This function is rarely used, as Dirent structures are provided by other
+// functions in this library that read and walk directories.
+func NewDirent(osPathname string) (*Dirent, error) {
+	fi, err := os.Lstat(osPathname)
+	if err != nil {
+		return nil, errors.Wrap(err, "cannot lstat")
+	}
+	return &Dirent{
+		name:     filepath.Base(osPathname),
+		modeType: fi.Mode() & os.ModeType,
+	}, nil
+}
+
+// Name returns the basename of the file system entry.
+func (de Dirent) Name() string { return de.name }
+
+// ModeType returns the mode bits that specify the file system node type. We
+// could make our own enum-like data type for encoding the file type, but Go's
+// runtime already gives us architecture independent file modes, as discussed in
+// `os/types.go`:
+//
+//    Go's runtime FileMode type has same definition on all systems, so that
+//    information about files can be moved from one system to another portably.
+func (de Dirent) ModeType() os.FileMode { return de.modeType }
+
+// IsDir returns true if and only if the Dirent represents a file system
+// directory. Note that on some operating systems, more than one file mode bit
+// may be set for a node. For instance, on Windows, a symbolic link that points
+// to a directory will have both the directory and the symbolic link bits set.
+func (de Dirent) IsDir() bool { return de.modeType&os.ModeDir != 0 }
+
+// IsRegular returns true if and only if the Dirent represents a regular
+// file. That is, it ensures that no mode type bits are set.
+func (de Dirent) IsRegular() bool { return de.modeType&os.ModeType == 0 }
+
+// IsSymlink returns true if and only if the Dirent represents a file system
+// symbolic link. Note that on some operating systems, more than one file mode
+// bit may be set for a node. For instance, on Windows, a symbolic link that
+// points to a directory will have both the directory and the symbolic link bits
+// set.
+func (de Dirent) IsSymlink() bool { return de.modeType&os.ModeSymlink != 0 }
+
+// Dirents represents a slice of Dirent pointers, which are sortable by
+// name. This type satisfies the `sort.Interface` interface.
+type Dirents []*Dirent
+
+// Len returns the count of Dirent structures in the slice.
+func (l Dirents) Len() int { return len(l) }
+
+// Less returns true if and only if the Name of the element specified by the
+// first index is lexicographically less than that of the second index.
+func (l Dirents) Less(i, j int) bool { return l[i].name < l[j].name }
+
+// Swap exchanges the two Dirent entries specified by the two provided indexes.
+func (l Dirents) Swap(i, j int) { l[i], l[j] = l[j], l[i] }