LogDog: Split CLI tool into package and main.

logdog/client/cli/subcommandCat.go

 // Copyright 2015 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 main
+package cli
 
 import (
         "errors"
         "io"
         "os"
 
         "github.com/golang/protobuf/proto"
         "github.com/luci/luci-go/common/config"
         log "github.com/luci/luci-go/common/logging"
         "github.com/luci/luci-go/common/proto/milo"
@@ skipping 157 matching lines @@
                 }
 
                 if err := proto.MarshalText(w, pb); err != nil {
                         log.WithError(err).Errorf(c, "Failed to marshal datagram as text.")
                         return false
                 }
 
                 return true
         }
 }