Reapply r104938 "Make svn update not prompt during a sync."

It wasn't broken. The tree collapsed around the same time for unrelated reason.

TBR=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8227036

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@105090 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/tests/gclient_scm_test.py b/tests/gclient_scm_test.py
index 6d5e380..89e84d3 100755
--- a/tests/gclient_scm_test.py
+++ b/tests/gclient_scm_test.py
@@ -73,6 +73,8 @@
       self.force = False
       self.reset = False
       self.nohooks = False
+      # TODO(maruel): Test --jobs > 1.
+      self.jobs = 1
 
   def Options(self, *args, **kwargs):
     return self.OptionsObject(*args, **kwargs)