Fix typo in Containerd configuration

[pasqualet]

What type of PR is this?
/kind bug

What this PR does / why we need it:
Fix typo introduced in #8123

Which issue(s) this PR fixes:
Fixes #8186

Does this PR introduce a user-facing change?:

NONE

[cristicalin]

I would propose something better:

Suggested change

	systemdCgroup: "true"
	systemdCgroup: "{{ (kubelet_cgroup_driver == 'systemd') | ternary('true', 'false', omit) }}"

As it stands, just fixing the typo breaks kubelet_cgroup_driver: cgroupfs scenario.

[floryut]

@pasqualet ok @cristicalin was also doing this on an other PR but fine by me if it's fine by him

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[cristicalin]

Forget my recommendation above as it is broken, the proper way would be to set

systemdCgroup: "{{ containerd_use_systemd_cgroup | ternary('true', 'false') }}"

... which is what I'm testing in the other PR.

I'm fine with this PR addressing the issue but in a proper way as pointed above, since the scope of #8175 is not to fix containerd support but switch to it as the default in CI, I'm actually pulling out unrelated changes into separate PRs to keep the git history clean.

[cristicalin]

I would ask you to remove this task al together in favour of modifying the options in a single place in default.yml, it is easier to grep for values and understand where they are coming from and how they depend on each other.

[pasqualet]

@cristicalin You're right, the ternary solution is better to understand and visualize, but here I was just updating the facts because it was already in place.

Previously, this cgroup option was developed in this way to follow the same pattern of other cgroups options in ./roles/kubernetes/node/tasks/facts.yml. Maybe all this part could be refactored to make it simpler and easier to review.

[cristicalin]

Thank you @pasqualet for the fix!

/lgtm