Add ask server.

Later we'll add the public keys for the askbot folks.

This will be mostly managed outside of puppet for now.

Change-Id: I5de4a164932ce87c1d4c329c8e839e979c271fa1
Reviewed-on: https://review.openstack.org/22047
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Approved: Jeremy Stanley <fungi@yuggoth.org>
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Tested-by: Jenkins