Adjust tests for new Ansible

Testing Farm 2023-03.1 has updated to a new Ansible
version.

Unfortunately, playbooks using the deprecated `warn:`
parameter for the shell/command modules will fail
because this had been deprecated

This should fix the problem.

Signed-off-by: Miroslav Vadkerti <mvadkert@redhat.com>

tests/roles/set_cgroups/tasks/main.yml

@@ -27,12 +27,10 @@
 - name: remove cgroup option from kernel flags
   shell:
     cmd: sed -i -e "s/^\(kernelopts=.*\)systemd\.unified_cgroup_hierarchy=.\(.*\)/\1 \2/" /boot/grub2/grubenv
-    warn: false
 
 - name: add it with the desired value
   shell:
     cmd: sed -i -e "s/^\(kernelopts=.*\)/\1 systemd.unified_cgroup_hierarchy=0/" /boot/grub2/grubenv
-    warn: false
   when: want_cgroups == 1
 
 - name: grubenv, post-edit, cat