this fixes the error below when create K8S ISO using scripts/util/create-kubernetes-binaries-iso.sh
```
+ echo 'Downloading image weaveworks/weave-kube:latest ---'
Downloading image weaveworks/weave-kube:latest ---
+ [[ weaveworks/weave-kube:latest == kubernetesui* ]]
+ [[ weaveworks/weave-kube:latest == apache* ]]
+ sudo ctr image pull weaveworks/weave-kube:latest
INFO[0000] trying next host error="failed to do request: Head https://weaveworks/v2/weave-kube/manifests/latest: dial tcp: lookup weaveworks: no such host" host=weaveworks
ctr: failed to resolve reference "weaveworks/weave-kube:latest": failed to do request: Head https://weaveworks/v2/weave-kube/manifests/latest: dial tcp: lookup weaveworks: no such host
```
* This PR/commit comprises of the following:
- Support to fallback on the older systemVM template in case of no change in template across ACS versions
- Update core user to cloud in CKS
- Display details of accessing CKS nodes in the UI - K8s Access tab
- Update systemvm template from debian 11 to debian 11.2
- Update letsencrypt cert
- Remove docker dependency as from ACS 4.16 onward k8s has deprecated support for docker - use containerd as container runtime
* support for private registry - containerd
* Enable updating template type (only) for system owned templates via UI
* edit indents
* Address comments and move cmd from patch file to cloud-init runcmd
* temporary change
* update k8s test to use k8s version 1.21.5 (instead of 1.21.3 - due to https://github.com/kubernetes/kubernetes/pull/104530)
* support for private registry - containerd
* Enable updating template type (only) for system owned templates via UI
* smooth upgrade of cks clusters
* update pom file with temp download.cloudstack.org testing links
* fix pom
* add cgroup config for containerd
* add systemd config for kubelet
* add additional info during image registry config
* update to official links
CNI plugin release naming has changed, https://github.com/containernetworking/plugins/releases
Release are named for host OS from 0.8.0 onwards.
This change adds check for 404 response code and attempts retry
Signed-off-by: Abhishek Kumar <abhishek.mrt22@gmail.com>
