Before this commit, we were gathering:
1 !all
7 network
7 hardware

After we are gathering:
1 !all
1 network
1 hardware

ansible_distribution_major_version is gathered by '!all'

Signed-off-by: Etienne Champetier <e.champetier@ateme.com>

* Gather just the necessary facts

* Move fact gathering to separate playbook.