Switch minikube to cri-o

This results in a much more elegant and flexible solution,
and supports our use of quay.io (unlike docker).

Change-Id: I00257b175c0445fc770a51bc69d30377c6f57382

playbooks/helm/pre.yaml

@@ -7,45 +7,15 @@
     - role: ensure-helm
   tasks:
     - name: Start minikube
-      command: minikube start --cpus max --memory max
+      command: minikube start --cpus max --memory max --container-runtime cri-o
 
-    - name: Patch minikube docker daemon config to use the buildset registry
+    - name: Replace minikube registries.conf
       block:
-        - name: Load minikube docker daemon config
-          command: minikube ssh sudo cat /etc/docker/daemon.json
-          register: daemon_json
+        - name: Copy registries.conf from the host to minikube
+          command: minikube cp /etc/containers/registries.conf /etc/containers/registries.conf
 
-        - name: Parse docker minikube daemon config
-          set_fact:
-            daemon_json_parsed: "{{ daemon_json.stdout | from_json }}"
-
-        - name: Add buildset registry to minikube docker daemon config
-          vars:
-            new_entries:
-              registry-mirrors: "['https://{{ buildset_registry_alias }}:{{ buildset_registry.port }}/']"
-          set_fact:
-            new_daemon_json_parsed: "{{ daemon_json_parsed | combine(new_entries) }}"
-
-        - name: Serialise new minikube docker daemon config
-          set_fact:
-            new_daemon_json: "{{ new_daemon_json_parsed | to_json }}"
-
-        - name: Save tmp new minikube docker daemon config
-          copy:
-            content: "{{ new_daemon_json }}"
-            dest: /tmp/minikube_docker_daemon.json
-            mode: 0644
-
-        - name: Copy new minikube docker daemon config
-          command: minikube cp /tmp/minikube_docker_daemon.json /etc/docker/daemon.json
-
-        - name: Clean up tmp new minikube docker daemon config
-          file:
-            path: /tmp/minikube_docker_daemon.json
-            state: absent
-
-        - name: Restart minikube docker daemon
-          command: minikube ssh sudo systemctl restart docker
+        - name: Restart minikube crio daemon
+          command: minikube ssh sudo systemctl restart crio
 
         - name: Wait for minikube k8s API to be back up
           command: kubectl get node