Update LogDog client to export its host.

logdog/client/coordinator/stream.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 coordinator
 
 import (
         "errors"
         "fmt"
         "time"
@@ skipping 296 matching lines @@
         dg.Data = aggregate
         dg.Partial = nil
         return le, nil
 }
 
 func loadStatePointer(stateP *LogStream, resp *logdog.GetResponse) error {
         if stateP == nil {
                 return nil
         }
 
+        // The service should always return this when requested, but handle the case
+        // where it doesn't for completeness.
+        if resp.Desc == nil {
+                return errors.New("descriptor was not returned")
+        }
+
         ls, err := loadLogStream(resp.Project, resp.Desc.Path(), resp.State, resp.Desc)
         if err != nil {
-                return fmt.Errorf("failde to load stream state: %v", err)
+                return fmt.Errorf("failed to load stream state: %v", err)
         }
 
         *stateP = *ls
         return nil
 }