Add glide.yaml and vendor deps

vendor/github.com/docker/distribution/docs/spec/auth/index.md

@@ -0,0 +1,12 @@
+---
+title: "Docker Registry Token Authentication"
+description: "Docker Registry v2 authentication schema"
+keywords: ["registry, on-prem, images, tags, repository, distribution, authentication, advanced"]
+---
+
+# Docker Registry v2 authentication
+
+See the [Token Authentication Specification](token.md),
+[Token Authentication Implementation](jwt.md),
+[Token Scope Documentation](scope.md),
+[OAuth2 Token Authentication](oauth.md) for more information.