Comment 4 for bug 1464656

Here's proposed approach to the solution:
1) in fuel-library, set pg_num to hardcoded small value (either 128 or pg_num/16 as calculated by nailgun)
2) in astute, increase pg_num to the value calculated by nailgun as a post-deployment action (after CirrOS VM image is uploaded to Glance to avoid yet another timeout)

Mykola, please discuss your pg_num formula with Alex Shaposhnikov, he has some good arguments on why number of pools shouldn't be factored into it.