[kubeadm] use v1beta3 configuration version

* extra admission controls now don't have a version in their file names
  eventratelimit.v1beta2.yaml.j2 -> eventratelimit.yaml.j2
* cri_socket variable includes the unix:// prefix to be conformat with
  upstream

roles/container-engine/crictl/templates/crictl.yaml.j2

@@ -1,4 +1,4 @@
-runtime-endpoint: unix://{{ cri_socket }}
-image-endpoint: unix://{{ cri_socket }}
+runtime-endpoint: {{ cri_socket }}
+image-endpoint: {{ cri_socket }}
 timeout: 30
 debug: false

roles/container-engine/nerdctl/templates/nerdctl.toml.j2

@@ -1,6 +1,6 @@
 debug             = false
 debug_full        = false
-address           = "unix://{{ cri_socket }}"
+address           = "{{ cri_socket }}"
 namespace         = "k8s.io"
 snapshotter       = "native"
 cni_path          = "/opt/cni/bin"