test_push: fix the broken go link

BUG=chromium:717686
TEST=None

Change-Id: I55a15acbdf4856591a340e0a68ef3b204f03ccd7
Reviewed-on: https://chromium-review.googlesource.com/494095
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Tested-by: Shuqian Zhao <shuqianz@chromium.org>
Commit-Queue: Shuqian Zhao <shuqianz@chromium.org>
diff --git a/site_utils/test_push.py b/site_utils/test_push.py
index c3aaa68..59803bc 100755
--- a/site_utils/test_push.py
+++ b/site_utils/test_push.py
@@ -644,7 +644,7 @@
     message = ('\nAll tests are completed successfully, the prod branch of the '
                'following repos ready to be pushed to the hash list below.\n'
                '%s\n\n\nInstructions for pushing to prod are available at '
-               'https://goto.google.com/autotest-to-prod' % updated_repo_msg)
+               'https://goto.google.com/autotest-to-prod ' % updated_repo_msg)
     print message
     # Send out email about test completed successfully.
     if arguments.email: