Fix for Optional request bodies

[ssalinas]

Seems that after the jersey/dropwizard upgrade the Optional bodies are not coming through correctly and are null instead of absent() when the body is not present. Updated the impacted endpoints (anything with an Optional body) to take the object (nullable) and construct the Optional afterwards. Actually made the tests look a bit nicer not wrapping everything in Optional.of() too.

I can test this out and try to get a 15.1 out if it looks good.
/cc @darcatron @stevenschlansker @dstryker @pennello @sannessa
/fixes #1525

[pennello]

Thanks @ssalinas. The test cleanup is nice, but it's a disappointing the injection is now a little more cumbersome. I wonder if this is actually intended given the jersey/dropwizard upgrade, or if it's an upstream bug.

[ssalinas]

@pennello , as far as I could tell it was never really documented that an Optional request body was something that was expected to work (at least I couldn't find it on the dropwizard or jersey docs easily). There is a lot around optional *Params and the validation annotations, but not much around actual request bodies.

[stevenschlansker]

Yeah, I'll second the surprise that the container doesn't do this for you (maybe there's a fix that should go upstream to Jersey?) but obviously I'm in favor of fixing the issue despite uglifying the code :)