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

client/swarming/swarming.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 swarming
 
 import (
         "errors"
         "net/http"
         "strings"
         "time"
 
-        "github.com/luci/luci-go/client/internal/lhttp"
-        "github.com/luci/luci-go/client/internal/retry"
+        "github.com/luci/luci-go/common/lhttp"
+        "github.com/luci/luci-go/common/retry"
 )
 
 // TaskID is a unique reference to a Swarming task.
 type TaskID string
 
 // Swarming defines a Swarming client.
 type Swarming struct {
         host string
 }
 
@@ skipping 65 matching lines @@
         User      string `json:"user"`
 }
 
 // Duration returns the total duration of a task.
 func (s *TaskResult) Duration() (out time.Duration) {
         for _, d := range s.Durations {
                 out += time.Duration(d) * time.Second
         }
         return
 }