Move retry and lhttp packages from client/internal to common/.

client/cmd/isolated/common.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package main
 
 import (
         "errors"
         "io"
         "io/ioutil"
         "log"
         "os"
 
-        "github.com/luci/luci-go/client/internal/lhttp"
         "github.com/luci/luci-go/client/internal/tracer"
+        "github.com/luci/luci-go/common/lhttp"
         "github.com/maruel/subcommands"
 )
 
 type commonFlags struct {
         quiet     bool
         verbose   bool
         tracePath string
         traceFile io.Closer
 }
 
@@ skipping 53 matching lines @@
         if s, err := lhttp.URLToHTTPS(c.serverURL); err != nil {
                 return err
         } else {
                 c.serverURL = s
         }
         if c.namespace == "" {
                 return errors.New("-namespace must be specified.")
         }
         return nil
 }