Update vendor dependencies

Change-Id: I3b1ca9f2687388c831d9d46a4e1de413ffae06ac

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

@@ -0,0 +1,34 @@
+/*
+Package godirwalk provides functions to read and traverse directory trees.
+
+In short, why do I use this library?
+
+* It's faster than `filepath.Walk`.
+
+* It's more correct on Windows than `filepath.Walk`.
+
+* It's more easy to use than `filepath.Walk`.
+
+* It's more flexible than `filepath.Walk`.
+
+USAGE
+
+This library will normalize the provided top level directory name based on the
+os-specific path separator by calling `filepath.Clean` on its first
+argument. However it always provides the pathname created by using the correct
+os-specific path separator when invoking the provided callback function.
+
+    dirname := "some/directory/root"
+    err := godirwalk.Walk(dirname, &godirwalk.Options{
+        Callback: func(osPathname string, de *godirwalk.Dirent) error {
+            fmt.Printf("%s %s\n", de.ModeType(), osPathname)
+            return nil
+        },
+    })
+
+This library not only provides functions for traversing a file system directory
+tree, but also for obtaining a list of immediate descendants of a particular
+directory, typically much more quickly than using `os.ReadDir` or
+`os.ReadDirnames`.
+*/
+package godirwalk