Fix config containerd template (#7051)

roles/container-engine/containerd/templates/config.toml.j2

@@ -29,7 +29,7 @@ disabled_plugins = ["restart"]
 {% if 'containerd' in containerd_config %}
 [plugins.cri.containerd]
 {% for param, value in containerd_config.containerd.items() %}
-  {{ param }} = {{ value }}
+  {{ param }} = "{{ value }}"
 {% endfor %}
 {% endif %}