The role will now use a known functional set of packages based on the
version of python being defined.
To allow users to add packages to a known functional version of
sphinx the variable `doc_building_extra_packages` has been added.
This option will union with `doc_building_packages`, installing all
python packages in a single set.
The releasenotes pre playbook has been updated so that it no longer
overrides the default package set when calling the "ensure-sphinx"
role. The playbook will now use the `doc_building_extra_packages`
option and include only the additional packages it needs. This change
allows folks to rely on the role to setup sphinx correctly without
needing to overriding everything.
Change-Id: Ib3d2fda164b173c82f17fabc20814753bfeaec6e
Signed-off-by: Kevin Carter <kecarter@redhat.com>
167cc321f4