[milo] {buildbucket,buildbot,swarming,logdog} -> backends/*.

milo/appengine/backends/buildbucket/html.go

 // Copyright 2016 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package buildbucket
 
 import (
         "errors"
         "net/http"
 
@@ skipping 39 matching lines @@
         result, err := builderImpl(c.Context, query)
         if err != nil {
                 common.ErrorPage(c, http.StatusInternalServerError, err.Error())
                 return
         }
 
         templates.MustRender(c.Context, c.Writer, "pages/builder.html", templates.Args{
                 "Builder": result,
         })
 }