[issue-11] docker build and image to help set up logstash pipeline

[hldnova]

Change log description

• Added Dockerfile and other files for building docker image
• Updated to a Pravega version that includes standalone binary
• Add hook to extract versions from build properties for automated build on docker hub

Purpose of the change

• fixes Docker build and image to simplify setup of pipeline #11

What the code does
Build docker image that includes

• Pravega
• Logstash and output plugin for Pravega
• Configurations and filters
• A hook to extract Pravega version from build properties to help automated build on docker hub.

How to verify it

• Automated build is available on docker hub: https://hub.docker.com/r/lidaheemc/logstash-output-pravega/
• README under docker folder contains the steps to test the pipeline

[EronWright]

N/A