Automatically update submodule config entries on sync.

The effect of this is to preserve the behavior of `git status`,
i.e., only changes in the top-level repository will be reported.

Updated test expectations; I have no idea what I'm doing.

Review URL: https://chromiumcodereview.appspot.com/10454088

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@140396 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/tests/gclient_scm_test.py b/tests/gclient_scm_test.py
index d7425c5..1767f52 100755
--- a/tests/gclient_scm_test.py
+++ b/tests/gclient_scm_test.py
@@ -785,6 +785,7 @@
         'cleanup',
         'diff',
         'pack',
+        'UpdateSubmoduleConfig',
         'relpath',
         'revert',
         'revinfo',