making ./validate run tests on all CPUs by default

[Sergei Trofimovich]

Good evening all!

Currently when being  ran './validate' script (without any parameters):
- builds ghc using 2 parallel jobs
- runs testsuite using 2 parallel jobs

I propose to change the default value to amount of available CPUs:
- build ghc using N+1 parallel jobs
- run testsuite using N+1 parallel jobs

Pros:
- first-time users will get faster ./validate
- seasoned users will need less tweaking for buildbots

Cons:
- for imbalanced boxes (32 cores, 8GB RAM) it might
   be quite painful to drag box out of swap

What do you think about it?

Actual patch: https://phabricator.haskell.org/D146

Thanks!

-- 

  Sergei
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