Split the jenkins job up in three parts, so each of them can run in
parallel, and the test part that has to run on a specific node (and
blocks it while running), finishes faster.
Don't install depends of pylint/docs jobs as they will run in docker
and the depends get installed once in the container.
Related: OS#5497
Depends: docker-playground Id5c75725d2fab46b29773fa4f637fa2d73fa7291
Depends: osmo-ci Iea4f15fd9c9f8f36cb8d638c48da000eafe746a4
Change-Id: I5245c529db729e209d78a02ab9c917a90d0e0206
8e45b75711