Revert "Add ask server."

This reverts commit 484a034118b55c44fd37bd066fb4f2ffd1cc39f5

Management is outsourced to the askbot folks.

Change-Id: I36c67211c078ac0cda4f8e4eca7f49c17cea40b2
Reviewed-on: https://review.openstack.org/22338
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: James E. Blair <corvus@inaugust.com>
Tested-by: Jenkins