Make sure we send back tracebacks even when running under production mode.

BUG=chromium-os:32276
TEST=Unittest + started up locally and verified with --production and stack
traces still work.

Change-Id: Ica8fc5dbcc142daa284876db604152cadbd356ac
Reviewed-on: https://gerrit.chromium.org/gerrit/26608
Tested-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
diff --git a/devserver.py b/devserver.py
index 80cd977..60b5b9b 100755
--- a/devserver.py
+++ b/devserver.py
@@ -77,6 +77,7 @@
                     'server.socket_host': '::',
                     'server.socket_port': int(options.port),
                     'response.timeout': 6000,
+                    'request.show_tracebacks': True,
                     'server.socket_timeout': 60,
                     'tools.staticdir.root':
                       os.path.dirname(os.path.abspath(sys.argv[0])),