Updated Dockerfile, added Jenkinsfile.#16523

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chadduffin wants to merge 2 commits intoandresriancho:masterfrom chadduffin:master

+258-77

Commits on Feb 1, 2018

Updated Dockerfile; base image, software versions, reduced layers, removed deprecated directives, and now successfully builds.
chadduffin
committed
Added basic Jenkinsfile to build the updated w3af Docker image.
chadduffin
committed