acloud: fix py3 compatible issue: TypeError: cannot use a bytes pattern on a string-like object

import six.b can work both py2 and py3.

BUG: 137195528
BUG: 145566087
Test: acloud-dev create
acloud-dev create --local-image
acloud-dev create --local-instance -y
acloud-dev create --local-instance --local-image -y
acloud-dev setup

Change-Id: I3acd3766d1036d2dad9971acfb7b355641fbc8fb
diff --git a/setup/gcp_setup_runner_test.py b/setup/gcp_setup_runner_test.py
index e26ea8c..cd81ab4 100644
--- a/setup/gcp_setup_runner_test.py
+++ b/setup/gcp_setup_runner_test.py
@@ -19,6 +19,7 @@
 import os
 import mock
 import six
+from six import b
 
 # pylint: disable=no-name-in-module,import-error,no-member
 from acloud import errors
@@ -27,7 +28,7 @@
 from acloud.public import config
 from acloud.setup import gcp_setup_runner
 
-_GCP_USER_CONFIG = """
+_GCP_USER_CONFIG = b("""
 [compute]
 region = new_region
 zone = new_zone
@@ -35,7 +36,7 @@
 account = new@google.com
 disable_usage_reporting = False
 project = new_project
-"""
+""")
 
 
 def _CreateCfgFile():