Fix candidate lookup in auto push script.

tools/push-to-trunk/test_scripts.py

 #!/usr/bin/env python
 # Copyright 2013 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
@@ skipping 938 matching lines @@
     TextToFile("", os.path.join(TEST_CONFIG["DEFAULT_CWD"], ".git"))
     TEST_CONFIG["SETTINGS_LOCATION"] = "~/.doesnotexist"
 
     self.Expect([
       Cmd("git status -s -uno", ""),
       Cmd("git status -s -b -uno", "## some_branch\n"),
       Cmd("git fetch", ""),
       URL("https://v8-status.appspot.com/current?format=json",
           "{\"message\": \"Tree is throttled\"}"),
       Cmd("git fetch origin +refs/heads/candidate:refs/heads/candidate", ""),
-      Cmd("git show-ref -s refs/heads/candidate", "abc123"),
+      Cmd("git show-ref -s refs/heads/candidate", "abc123\n"),
       Cmd(("git log -1 --format=%H --grep=\""
            "^Version [[:digit:]]*\.[[:digit:]]*\.[[:digit:]]* (based\""
            " origin/candidates"), "push_hash\n"),
       Cmd("git log -1 --format=%s push_hash",
           "Version 3.4.5 (based on abc101)\n"),
     ])
 
     auto_push.AutoPush(TEST_CONFIG, self).Run(AUTO_PUSH_ARGS + ["--push"])
 
     state = json.loads(FileToText("%s-state.json"
@@ skipping 535 matching lines @@
 
 Review URL: https://codereview.chromium.org/83173002
 
 ------------------------------------------------------------------------""")
     self.assertEquals(
 """Prepare push to trunk.  Now working on version 3.23.11.
 
 R=danno@chromium.org
 
 Committed: https://code.google.com/p/v8/source/detail?r=17997""", body)