Features: morphlines

Integrates Cloudera Morphlines into Camus Sweeper using `CamusMorphlineAvroKeyJob` which can be injected using properties file, so no divergence from upstream.

@ljank @vidma 
This class is mostly https://github.com/vinted/camus/blob/master/camus-sweeper/src/main/java/com/linkedin/camus/sweeper/mapreduce/CamusSweeperAvroKeyJob.java, except that Morphlines setup is plugged in.