Use default value of 'all' for submodule.*.ignore.

Review URL: https://chromiumcodereview.appspot.com/10630010

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@143464 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/gclient_scm.py b/gclient_scm.py
index 82947e4..b07c744 100644
--- a/gclient_scm.py
+++ b/gclient_scm.py
@@ -198,7 +198,7 @@
     submod_cmd = ['git', 'config', '-f', '$toplevel/.git/config',
                   'submodule.$name.ignore', '||',
                   'git', 'config', '-f', '$toplevel/.git/config',
-                  'submodule.$name.ignore', 'dirty']
+                  'submodule.$name.ignore', 'all']
     cmd = ['git', 'submodule', '--quiet', 'foreach', ' '.join(submod_cmd)]
     try:
       gclient_utils.CheckCallAndFilter(