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

client/cmd/isolate/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"
         "fmt"
         "io"
         "io/ioutil"
         "log"
         "os"
 
         "github.com/luci/luci-go/client/internal/common"
-        "github.com/luci/luci-go/client/internal/lhttp"
         "github.com/luci/luci-go/client/internal/tracer"
         "github.com/luci/luci-go/client/isolate"
+        "github.com/luci/luci-go/common/lhttp"
         "github.com/maruel/subcommands"
 )
 
 type commonFlags struct {
         quiet     bool
         verbose   bool
         tracePath string
         traceFile io.Closer
 }
 
@@ skipping 114 matching lines @@
 
         if flags&RequireIsolateFile != 0 && c.Isolate == "" {
                 return errors.New("-isolate must be specified")
         }
         if flags&RequireIsolatedFile != 0 && c.Isolated == "" {
                 return errors.New("-isolated must be specified")
         }
 
         return nil
 }