Break out test tasks to run in parallel

[Temikus]

Unrelated resources should run in parallel, so we can quickly see the build status of things we're actually interested in.

I think of doing multiple rake tasks for each section - compute, monitoring, pubsub, sql, etc. and then running them in parallel pipelines in Concourse.

Bringing this up since tests already take about an hour and 30% percent of that time is only a handful of SQL tests (v2 instances take 5+min to get instantiated)

[Temikus]

Wrong repo, this needs to be upstream: fog/fog-google#341