devinstall test: use the new 'updatable' argument CreateVMImage()

This is necessary for CL:187026

BUG=chromium:336638
CQ-DEPEND=CL:187026
TEST=None

Change-Id: Ib9a7a5be71601ce9acd34201483510a2fb861f23
Reviewed-on: https://chromium-review.googlesource.com/187066
Reviewed-by: Yu-Ju Hong <yjhong@chromium.org>
Tested-by: Yu-Ju Hong <yjhong@chromium.org>
Commit-Queue: Yu-Ju Hong <yjhong@chromium.org>
(cherry picked from commit b933bfc13d6f80c1bb2ac2853ce92924e757fa6f)
Reviewed-on: https://chromium-review.googlesource.com/187660
Reviewed-by: Matthew Yuan <matthewyuan@chromium.org>
Tested-by: Matthew Yuan <matthewyuan@chromium.org>
diff --git a/devmode-test/devinstall_test.py b/devmode-test/devinstall_test.py
index f1ef374..64832ef 100755
--- a/devmode-test/devinstall_test.py
+++ b/devmode-test/devinstall_test.py
@@ -12,7 +12,6 @@
 stateful partition and then runs gmerge.
 """
 
-import getpass
 import logging
 import optparse
 import os
@@ -95,7 +94,7 @@
     """Pre-test modification to the image and env to setup test."""
     logging.info('Setting up the image %s for vm testing.', self.image_path)
     vm_path = vm.CreateVMImage(image=self.image_path, board=self.board,
-                               full=False)
+                               updatable=False)
 
     logging.info('Making copy of the vm image %s to manipulate.', vm_path)
     self.working_image_path = os.path.join(self.tmpdir,