store openstack external cloud controller ca.cert in a k8s secret instead of the host filesystem (#7603)

* Calico: add v3.19.1 hashes

* enable liveness probe for calico-kube-controllers

3.19.1

* Calico: drop support for v3.16.x

* Calico: promote v3.18.3 as default

Minor spelling edits.  Was reading your documentation.

* Override the default value of containerd's root, state, and oom_score configurations

* Add tests data for containerd_storage_dir, containerd_state_dir and containerd_oom_score variables

It can be counterintuitive for the downloaded files to show up on local host when download_localhost is false, this explains the reason.

Basically we need to make necessary TCP/UDP ports open.
However the necessary ports are so many, and sometimes it is difficult
to figure out that is due to firewall issues or not if facing deployment
issues.
To distinguish a root problem on such situation, this adds contrib
playbook to disable the service firewall for Kubespray development
and test.

* 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

* Replace map in Terraform scripts with tomap (#7576)

* Fix Terraform linter warnings (#7576)

* 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

Enables Calico serviceAccount token monitoring and update of /etc/cni/net.d/calico-kubeconfig if need be. (#7586)

Since K8S 1.21, BoundServiceAccountTokenVolume feature gate is in beta stage, thus activated by default (anyone who follows CSI guidelines has enabled AllAlpha and faced the issue before 1.21).
With this feature, SA tokens are regenerated every hour.
As a consequence for Calico CNI, token in /etc/cni/net.d/calico-kubeconfig copied from /var/run/secrets/kubernetes.io/serviceaccount in install-cni initContainer expires after one hour and any pod creation fails due to unauthorization.
Calico pods need to be restarted so that /etc/cni/net.d/calico-kubeconfig is updated with the new SA token.

Fix coredns image repo and tag typo for #7570

* Remove the duplicate task in etcd role

* Remove inessential delegate_to

Signed-off-by: Cedric Hnyda <cedric.hnyda@itera.io>

* Add krew support

* Add reset for krew

* Update install krew(local)

* ansible lint

* yamllint

* fix krew default vars

* fix kubectl_localhost mode

* replace include

* fix e206