[autotest] add chromeos2-devserver6 to global config

chromeos2-devserver6 has been set up to work as devserver.
so add it to the list.

TEST=test with cbf server
BUG=None
DEPLOY=apache

Change-Id: I98d9d22f8510b999e72bb3563a9f0dfa2766ebee
Reviewed-on: https://chromium-review.googlesource.com/217584
Reviewed-by: Prashanth B <beeps@chromium.org>
Tested-by: Fang Deng <fdeng@chromium.org>
1 file changed