Segregate obnoxiously slow test

[abitmore]

Cherry-picked from #1126.

@nathanhourt wrote:

The main test driver should run fairly quickly; extremely slow tests should be moved to a
separate driver so developer time isn't wasted waiting for many runs of a slow test.

Really more tests should be moved over, but I'm too lazy right now.

I wrote:

There were efforts to include all consensus related tests into chain_test. Moving tests outside of chain_test will likely make them be ignored and may cause unexpected consequences.

More input wanted. Thanks.

[jmjatlanta]

My opinion: All tests should run by default. Perhaps we can subdivide tests yet again? ./chain-test --run_test=fast_tests/* Or maybe categorize by importance. So if there is a slow test, but it checks something very idiosyncratic, put it in "simple_tests" suite instead of "critical_tests". But if it is slow and very important... well, you get the picture.

[abitmore]

Thanks to @pmconrad, Travis build is now much faster, I think we can add more tests there.

[pmconrad]

Agree with @jmjatlanta - all tests should be run by default. call_order_tests takes 10 seconds on my desktop, that's nothing.
IMO can close this PR without merging.

[pmconrad]

No further comments - closing.