go-docker: support functional tests

db: initialize bigint, boolean columns

* add linking to go-docker command and remove host networking
* add functional/repo to functional tests script

gorp hates nil.

DB Migrations for Dex

Migrations happen only in the overlord, so there's no thundering herd,
and database initialziation can be more easily controlled.

All repo tests build their tables by applying all the migrations. This
way we know our migrations are functional.

*: move original project to dex