Bug fix in factory toolkit installer

When patching a test image, the installation destination for /usr/local
should be at dev_image instead of dev_image/local.

BUG=chrome-os-partner:24107
TEST=None

Change-Id: I9c3942b3e7b2c348cac173388515fd9fac2df77d
Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/183696
Reviewed-by: Jon Salz <jsalz@chromium.org>
diff --git a/py/toolkit/installer.py b/py/toolkit/installer.py
index 99fa03d..b90ee4c 100755
--- a/py/toolkit/installer.py
+++ b/py/toolkit/installer.py
@@ -33,7 +33,7 @@
   """
   def __init__(self, src, args):
     if args.patch_test_image:
-      self._usr_local_dest = os.path.join(args.dest, 'dev_image', 'local')
+      self._usr_local_dest = os.path.join(args.dest, 'dev_image')
       self._var_dest = os.path.join(args.dest, 'var_overlay')
       if (not os.path.exists(self._usr_local_dest) or
           not os.path.exists(self._var_dest)):