optimize the format of evictionHard in kubelet-config.yaml template (#9204)

roles/kubernetes/node/templates/kubelet-config.v1beta1.yaml.j2

@@ -104,10 +104,10 @@ systemReserved:
 {% endif %}
 {% if is_kube_master|bool and eviction_hard_control_plane is defined and eviction_hard_control_plane %}
 evictionHard:
-  {{ eviction_hard_control_plane | to_nice_yaml(indent=2) }}
+  {{ eviction_hard_control_plane | to_nice_yaml(indent=2) | indent(2) }}
 {% elif not is_kube_master|bool and eviction_hard is defined and eviction_hard %}
 evictionHard:
-  {{ eviction_hard | to_nice_yaml(indent=2) }}
+  {{ eviction_hard | to_nice_yaml(indent=2) | indent(2) }}
 {% endif %}
 resolvConf: "{{ kube_resolv_conf }}"
 {% if kubelet_config_extra_args %}