Clean up dep requirements in `setup.py`.

[xpconanfan]

• Move test-only deps out of package dep list.
• Remove unnecessary deps.

setuptools version in ubuntu dist is no longer a concern.

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This change is 

[winterfroststrom]

apparently timeout decorator is used in monsoon.py

[xpconanfan]

Whaa, how come localing running unit tests didn't catch this..

[winterfroststrom]

because our monsoon unit test have like no coverage

[winterfroststrom]

also, you probably already have the dependency installed

[xpconanfan]

the test sets up deps from scratch every time. I think it's just we don't have coverage for monsoon...

[winterfroststrom]

no, I mean that the reason why running it locally passed for you was probably because a previous run of it installed the deps, where restinalling isn't actually necessary, otherwise, if it was never installed, and the reinstall logic didn't install it, I have a hard time imagining it passing

[xpconanfan]

Oh wait, it's the other way around...

[winterfroststrom]

build still broken