Update registry server to support repository class

Use whitelist of allowed repository classes to enforce.
By default all repository classes are allowed.

Add authorized resources to context after authorization.

Signed-off-by: Derek McGowan <derek@mcgstyle.net> (github: dmcgowan)

registry/auth/token/accesscontroller.go

@@ -261,6 +261,8 @@ func (ac *accessController) Authorized(ctx context.Context, accessItems ...auth.
 		}
 	}
 
+	ctx = auth.WithResources(ctx, token.resources())
+
 	return auth.WithUser(ctx, auth.UserInfo{Name: token.Claims.Subject}), nil
 }