Removed vulnerabilities by replacing libraries with fixed versions.

[hendychua]

This PR fixes all the vulnerabilities in the master branch. The libraries replaced are:

1. jbcrypt 0.3m to 0.4 (This also removed a vulnerable method call in the code. The code still builds and works.)
2. kafka-clients 0.9.0.1 to 0.10.1.0
3. lz4 and xxhash 1.2.0 to 1.3.0.
4. netty 3.7.0.Final to netty 3.9.8.Final
5. zookeeper 3.4.6 to 3.4.7.