* rename ansible groups to use _ instead of -

k8s-cluster -> k8s_cluster
k8s-node -> k8s_node
calico-rr -> calico_rr
no-floating -> no_floating

Note: kube-node,k8s-cluster groups in upgrade CI
      need clean-up after v2.16 is tagged

* ensure old groups are mapped to the new ones

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.