[autotest] Enable module headers in setup script

This module is required to start Autotest afe.

BUG=None
TEST=local run the script

Change-Id: I4a43923ee04e9481e7110300cab1b71ad6e5b234
Reviewed-on: https://chromium-review.googlesource.com/220751
Tested-by: Dan Shi <dshi@chromium.org>
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Dan Shi <dshi@chromium.org>
diff --git a/site_utils/setup_dev_autotest.sh b/site_utils/setup_dev_autotest.sh
index fb83d03..8b7b11a 100755
--- a/site_utils/setup_dev_autotest.sh
+++ b/site_utils/setup_dev_autotest.sh
@@ -262,6 +262,8 @@
 sudo a2enmod wsgi
 # enable version
 sudo a2enmod version
+# enable headers
+sudo a2enmod headers
 # Setup permissions so that Apache web user can read the proper files.
 chmod -R o+r "${AT_DIR}"
 find "${AT_DIR}"/ -type d -print0 | xargs --null chmod o+x