gitignore: Ignore files from production servers.

To make git status and repo status more useful, ignore files
that are expected to exist on the production servers.

BUG=None
TEST=Manual check on real server.

Change-Id: Ia5cf8395f80cfb38d7e1f083a68da2d7707632f1
Reviewed-on: https://chromium-review.googlesource.com/223734
Tested-by: Don Garrett <dgarrett@chromium.org>
Reviewed-by: Prashanth B <beeps@chromium.org>
Commit-Queue: Don Garrett <dgarrett@chromium.org>
diff --git a/.gitignore b/.gitignore
index 94a7c0c..fbc9ffd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -49,3 +49,9 @@
 monitor_db.pid
 server/cros/chaos_shadow_ap_list.conf
 server/site_tests/network_WiFiChaosPSK/control.local
+
+# These exist on the production servers.
+bug_filing_oauth_credentials.dat
+site_utils/autotest_private/
+site_utils/autotest_tools/
+site_utils/devserver/