This patch adds the documentation directly in the sphinx role
documentation index. All variables have been commented with a proper
description to be included automatically in the sphinx build.
This patch also disables the facts gathering because this validation is
only using the package_facts.
Change-Id: I9ebed531fba6966a4122f0c55eac784cbb6954cc
Signed-off-by: Gael Chamoulaud (Strider) <gchamoul@redhat.com>