Remove configuration variable kubeadm_control_plane

* kube-proxy never gets deployed so need to remove it

It was documented as if it were an Ansible variable, but it is a Terraform variable.
This also means the colon syntax was incorrect. TF variables are assigned with an equals sign.

Co-authored-by: rptaylor <rptaylor@uvic.ca>

* Make metallb image repos configurable

* Moved metallb image repo definitions to download role defaults

* Removed comment. These are set in download defaults

After host reboot kubelet and crio goes into a loop and no container is started.

storage_driver in crio.conf overrides system defaults in etc/containers/storage.conf

/etc/containers/storage.conf is installed by package containers-common dependency
installed from cri-o (centos7) and contains "overlay".

Hosts already configured with overlay2 should be reconfigured and the
/var/lib/containers content removed.

* Add comment from roles/kubespray-defaults/defaults/main.yaml clarifying network allocation and sizes

Signed-off-by: Mikael Johansson <mik.json@gmail.com>

* Rewrite of the comment and added new examples

Signed-off-by: Mikael Johansson <mik.json@gmail.com>

Allowing resource management of metrics-server container.  Will allow fine-tuning of resource allocation and solving throttling issues. Setting defaults as per the current request & limit allocation: cpu: 43m, memory 55Mi for both limits & requests. (#6652)

Signed-off-by: Brendan Holmes <holmesb@users.noreply.github.com>

Co-authored-by: Brendan Holmes <holmesb@users.noreply.github.com>

* remove podman cni plugin

* configure networkamanger global dns

* allow installation of python3-libselinux by disabling update repo temporary

* remove ipv4 section because it is not a valid configuration

* Fix upgrade playbook name

* Fix my fix :)

Removes these startup warnings:

Warning: For remote container runtime, --pod-infra-container-image is ignored in kubelet, which should be set in that remote runtime instead
Using "/var/run/crio/crio.sock" as endpoint is deprecated, please consider using full url format "unix:///var/run/crio/crio.sock".