Update service related integration tests to be less picky

v0.8.1 doesn't log the same messages as v0.8.0 (for some reason), there's
been changes to capitalisation and whatnot.
Update default kafka and scala versions

* kafka, v0.8.0 -> v0.8.1
* scala, v2.8.0 -> v2.9.2

The future is now, deal with it.