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

client/cmd/swarming/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"
         "os"
 
-        "github.com/luci/luci-go/client/internal/lhttp"
+        "github.com/luci/luci-go/common/lhttp"
         "github.com/maruel/subcommands"
 )
 
 type commonFlags struct {
         subcommands.CommandRunBase
         serverURL string
         verbose   bool
 }
 
 // Init initializes common flags.
 func (c *commonFlags) Init() {
         c.Flags.StringVar(&c.serverURL, "server", os.Getenv("SWARMING_SERVER"), "Server URL; required. Set $SWARMING_SERVER to set a default.")
         c.Flags.BoolVar(&c.verbose, "verbose", false, "Enable logging.")
 }
 
 // Parse parses the common flags.
 func (c *commonFlags) Parse(a subcommands.Application) error {
         if c.serverURL == "" {
                 return errors.New("must provide -server")
         }
         s, err := lhttp.URLToHTTPS(c.serverURL)
         if err != nil {
                 return err
         }
         c.serverURL = s
         return nil
 }