Update to the new poolboy API

[Vagabond]

Worker arguments are passed as a separate list, now.

[travisbot]

This pull request passes (merged d1f59b5 into 6b03b51).

[rzezeski]

Doing a fly-by pass on this PR...is this still relevant?

[Vagabond]

This is absolutely something we need to do, except it may be even more involved now, because of all the changes upstream.

[slfritchie]

@Vagabond Time for some belated repo curating ... is there any plan to fix this for Riak 2.0?

[slfritchie]

I know you're busy, Andrew, but ... re-ping?

[rzezeski]

Setting milestone to 2.1 since it's something we absolutely need to do but too late for 2.0.

[jrwest]

leaving at milestone 2.1

[JeetKunDoug]

@seancribbs is this change still necessary? If so, what do we do about our branch of poolboy? Update ours to latest?

[Vagabond]

Run the quickcheck tests again, make sure things are still good and update, yeah.

IIRC, some of the poolboy changes caused a minor problem with the EQC tests around worker exits, but I think it was a cosmetic problem, not a property violation. Make sure you run a lot of iterations of the tests.

[JeetKunDoug]

FYI - this PR is superseded by #639.