tsmon: read hostname and region from config file

common/tsmon/config_test.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 tsmon
 
 import (
         "io/ioutil"
         "os"
         "testing"
@@ skipping 14 matching lines @@
                 if err != nil {
                         t.Fail()
                 }
                 defer tf.Close()
                 defer os.Remove(tf.Name())
 
                 c, err := loadConfig(tf.Name())
                 So(c.Endpoint, ShouldEqual, "")
                 So(c.Credentials, ShouldEqual, "")
                 So(c.AutoGenHostname, ShouldEqual, false)
+                So(c.Hostname, ShouldEqual, "")
+                So(c.Region, ShouldEqual, "")
                 So(err, ShouldNotBeNil)
         })
 
         Convey("Full file", t, func() {
                 tf, err := ioutil.TempFile("", "config_test")
                 if err != nil {
                         t.Fail()
                 }
                 defer tf.Close()
                 defer os.Remove(tf.Name())
 
-                tf.WriteString(`{"endpoint": "foo", "credentials": "bar", "autogen_hostname": true}`)
+                tf.WriteString(`
+                        {"endpoint":         "foo",
+                         "credentials":      "bar",
+                         "autogen_hostname": true,
+                         "hostname":         "test_host",
+                         "region":           "test_region"
+                        }`)
                 tf.Sync()
 
                 c, err := loadConfig(tf.Name())
                 So(c.Endpoint, ShouldEqual, "foo")
                 So(c.Credentials, ShouldEqual, "bar")
                 So(c.AutoGenHostname, ShouldEqual, true)
+                So(c.Hostname, ShouldEqual, "test_host")
+                So(c.Region, ShouldEqual, "test_region")
                 So(err, ShouldBeNil)
         })
 }