Use cgroup v1 in Fedora +31 (#6862)

Fedora 31 uses Cgroups v2 by default. This change by passes the kernel
parameter systemd.unified_cgroup_hierarchy=0.

Signed-off-by: Victor Morales <v.morales@samsung.com>

roles/container-engine/cri-o/tasks/main.yaml

@@ -25,6 +25,20 @@
   tags:
     - facts
 
+- name: disable unified_cgroup_hierarchy in Fedora 31+
+  command: grubby --update-kernel=ALL --args="systemd.unified_cgroup_hierarchy=0"
+  when:
+    - ansible_distribution == "Fedora"
+    - (ansible_distribution_major_version | int) >= 31
+    - ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] is not defined or ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] != '0'
+
+- name: reboot in Fedora 31+
+  reboot:
+  when:
+    - ansible_distribution == "Fedora"
+    - (ansible_distribution_major_version | int) >= 31
+    - ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] is not defined or ansible_proc_cmdline['systemd.unified_cgroup_hierarchy'] != '0'
+
 - import_tasks: "crio_repo.yml"
 
 - import_tasks: "crictl.yml"