first stab at using retrypolicies

[mosesn]

@softprops, I remember you said that util-zk retrypolicies would need to be augmented to retry on configurable exceptions, but I don't remember which exceptions those were now . . . how does it work?

[softprops]

sorry I'm just seeing this now @mosesn ! Ill have a closer look this weekend.

[mosesn]

this pull request is pretty wrong, actually. we probably want to use the finagle retry policy, not the util-zk retrypolicy, and I commented out an sbt plugin that I shouldn't have. I'll also try to fix it this weekend, but it's probably not worth looking at until I get a chance to push a new version.

[mosesn]

So I have a working version, but it's not up to snuff. The big problem is that the finagle-core retrypolicy is very different from the retries or util-zk. I think I can get it to a good place, but it's going to take some thought.