[SPARK-LLAP-50] Remove `incubating` from Apache Ranger (#51)
[SPARK-LLAP-50] Remove `incubating` from Apache Ranger (#51)

## What changes were proposed in this pull request?

Apache Ranger becomes TLP now.

https://blogs.apache.org/foundation/entry/the-apache-software-foundation-announces3

## How was this patch tested?

N/A

This closes #50.
hortonworks-spark/spark-llap,hortonworks-spark/spark-llap,hortonworks-spark/spark-llap