Use officially blessed Kafka builds over custom builds

[wizzat]

I was talking with @dpkp and @mumrah on IRC about using officially blessed Kafka builds instead of downloading and re-building from scratch in the test suite. Unless someone knows where there's a semi-blessed build of unreleased Kafka versions (aka 0.8.2), any support for them is going to still require downloading and building from a git submodule. It seems there are three possibilities to make this happen:

• Download directly from Apache
• Put them on CDN and download from there
• Check them into Git

After some discussion, I think the best (simplest) answer is to download from Apache and just deal with it when Apache goes down and causes the build to fail. This is the currently outstanding build releases:

Kafka 0.8.0
https://archive.apache.org/dist/kafka/0.8.0/kafka_2.8.0-0.8.0.tar.gz

Kafka 0.8.1 (Using the recommended 2.9.2 build)
https://archive.apache.org/dist/kafka/0.8.1/kafka_2.9.2-0.8.1.tgz

Kafka 0.8.1.1 (Using the recommended 2.9.2 build)
https://www.apache.org/dyn/closer.cgi?path=/kafka/0.8.1.1/kafka_2.9.2-0.8.1.1.tgz

[dpkp]

agree -- i think all official releases can be found at https://archive.apache.org/dist/kafka/VERSION/kafka_SCALAVER-KAFKAVER.tgz

this is where the kafka chef cookbook installs from by default (https://github.com/mthssdrbrg/kafka-cookbook), though the travis setup for that cookbook only runs unit tests right now.

[dpkp]

PR for this issue is #193