bisect-kit: helper script to prepare source trees for ChromeOS bisection

Typical usage:

  Initial setup:
    $ setup_cros_bisect.py init --chromeos
    $ setup_cros_bisect.py init --chrome
    $ setup_cros_bisect.py init --android=pi-arc-dev

  Sync code if necessary:
    $ setup_cros_bisect.py sync

  Create source trees for bisection
    $ setup_cros_bisect.py new --session=12345

  After bisection finished, delete trees
    $ setup_cros_bisect.py delete --session=12345

BUG=None
TEST=run above commands

Change-Id: I6f94b57b9a2967addf6d654dd571a68b2d06e0d7
Reviewed-on: https://chromium-review.googlesource.com/1242666
Commit-Ready: Kuang-che Wu <kcwu@chromium.org>
Tested-by: Kuang-che Wu <kcwu@chromium.org>
Reviewed-by: Chung-yih Wang <cywang@chromium.org>
diff --git a/bisect_kit/cli_test.py b/bisect_kit/cli_test.py
index 9bbbb78..3fc38aa 100644
--- a/bisect_kit/cli_test.py
+++ b/bisect_kit/cli_test.py
@@ -130,7 +130,7 @@
 
   def setUp(self):
     self.session_base = tempfile.mkdtemp()
-    self.patcher = mock.patch.object(cli, 'DEFAULT_SESSION_BASE',
+    self.patcher = mock.patch.object(common, 'DEFAULT_SESSION_BASE',
                                      self.session_base)
     self.patcher.start()