* add support for using ansible 2.10.x for deploying kubespray

* move dns-autoscaler-clusterrole{binding}.yml to files/ folder

* note that ansible 2.10 is now experimentally supported

* coredns: move files to templates like before #4341

* add initial MetalLB docs

* metallb allow disabling the deployment of the metallb speaker

* calico>=3.18 allow using calico to advertise service loadbalancer IPs

* Document the use of MetalLB and Calico

* clean MetalLB docs

* Upgrade cilium roles

* Del old test result

* Add hubble ui examples

* Refactor hubble metrics

* Markdown fix pipeline errors

* yamllint check and fix

* refactor install from https://github.com/kubernetes-sigs/kubespray/pull/7520

* Docs syntax change (fix)

* Cilium set default 1.8.9

* Update cilium version in Readme

* 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

* crio: add supported versions 1.20 and 1.21 and align default with k8s version

* cri-o: drop versions 1.17 and 1.18 from version matrix

* update note on cri-o version alignment

* Set containerd version to 1.4.3

* Set containerd version to 1.4.4

Co-authored-by: Barry Melbourne <9964974+bmelbourne@users.noreply.github.com>

* Remove contrib/vault

This is marked as broken since 2018 / 3dcb9146
This still reference apiserver.pem, not used since ddffdb63

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

* Finish nuking vault from the codebase

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

See: `https://github.com/cloudnativelabs/kube-router/releases/tag/v1.2.0`

15.1 has reached EOL on 2021-02-02.

Signed-off-by: Maciej Wereski <m.wereski@partner.samsung.com>

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

We have multiple breakage report with Ansible 2.10+ in https://github.com/kubernetes-sigs/kubespray/issues/6762


README.md already recommended 2.9+

Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

* SHAs for 1.19.6, 1.18.14, 1.18.13, 1.17.16 and 1.17.15

* Fix etcd version in README

* Bump kube_version to 1.19.6